what does phd mean but not a degree

“M.D.” vs. “Ph.D.” vs. “Dr.”: Are They Synonyms?

Quick: when you hear the word doctor , what do you picture?

Most would probably describe someone in a white lab coat with a stethoscope hanging around their neck or someone in medical scrubs—someone you would seek out if you have a deep cut that needed stitches.

That word doctor , however, is a title assigned to many who don’t come close to that description, many of whom you wouldn’t want stitching up that cut. Take your English professor, for instance. No offense, Dr. Barrett. 

It can all be a bit confusing, which is why it’s important to know who and why someone might be called a doctor , as well as what all those initials and abbreviations after their name mean. Here we break it all down.

What does Dr. mean?

Let’s start with doctor or D r . for short. While the first definition of the word is “ a person licensed to practice medicine,” that doesn’t mean you want to take medical advice from anyone who calls themselves a doctor . There are many looser definitions of the word that follow and, frankly, make things a bit confusing.

For example, the third definition is older slang for a “cook, as at a camp or on a ship,” while the seventh entry is “an eminent scholar and teacher.” Bugs Bunny didn’t help matters either by plying anyone and everyone with his famous greeting,“What’s up, doc?” 

The term doctor can be traced back to the late 1200s, and it stems from a Latin word meaning “to teach.” It wasn’t used to describe a licensed medical practitioner until about 1400, and it wasn’t used as such with regularity until the late 1600s. It replaced the former word used for medical doctors— leech , which is now considered archaic. 

WATCH: When Did The Word "Doctor" Become Medical?

Physician vs. doctor : are these synonyms.

While the term physician is a synonym for doctor , it’s typically used to refer to those who practice general medicine rather than those who perform surgery, aka surgeons . 

A quack , on the other hand, is defined as “ a fraudulent or ignorant pretender to medical skill.”

What does M.D. mean?

Moving on to initials that carry more weight than a nod from Bugs, let’s look at M.D.s .

M.D. , which can be used with or without the periods ( M.D. or MD )  is the designation for a medical doctor. This is earned by attending medical school (typically a four-year program after completing at least one undergraduate degree, plus a residency program), and learning to diagnose patients’ symptoms and offer treatment. 

The initials M and D stem from the Latin title  Medicīnae Doctor. There are many different types of doctors, with different specialties, but if you have a physical ailment, visiting a doctor with the initials M.D. is a good place to start.

Specialty doctors may add even more initials to their title, such as DCN (doctor of clinical nutrition), DDS (doctor of dental surgery), or countless others they acquire with additional training. To make things even more confusing, some may add abbreviations from medical associations they belong to, such as FAAEM (Fellow of the American Academy of Emergency Medicine). 

Go Behind The Words!

• By clicking "Sign Up", you are accepting Dictionary.com Terms & Conditions and Privacy policies.
• Phone This field is for validation purposes and should be left unchanged.

What does Ph.D. mean?

As for Ph.D. , this stands for “doctor of philosophy.” It stems from the Latin term Philosophiae Doctor.

You can get a Ph.D. in any number of subjects, from anthropology to mythological studies. It’s not an easy feat, however, as to earn one, you must do original research and write a dissertation . 

Ph.D. vs. M.D .: are these synonyms?

There are two big differences between Ph.D. s and M.D .s. When it comes to medicine, M.D.s can prescribe medications, and Ph.D.s can’t. And yes, it’s possible to be both an M.D. and a Ph.D. In fact, some med schools offer programs in which you can achieve both simultaneously. 

You can also get a professional doctorate degree in a number of fields. For example, you might receive a doctorate of education, an  Ed.D . 

So, in a nutshell, both M.D.s and Ph.Ds can be referred to as doctors . If you’re looking for someone to treat what ails you physically, then you want at least an M.D. following their name. If you want to dig deep into a subject and get advice from someone who has done their own research and who likely knows the latest and greatest developments in a particular area, then you’re probably looking for a Ph.D. And if someone has both, even better—depending on your needs, it may be just what the doctor ordered.

Want more synonyms? Get Thesaurus.com’s sizzling synonyms right in your inbox! 

Commonly Confused

Trending Words

Hobbies & Passions

Word Origins

[ hahy -p uh -nim ]

• Comments This field is for validation purposes and should be left unchanged.

• For Individuals
• For Businesses
• For Universities
• For Governments
• Online Degrees
• Join for Free

What Does 'PhD' Stand For?

A PhD is a terminal academic degree students typically pursue when they're interested in an academic or research career.

A PhD is the highest possible academic degree a student can obtain. PhD stands for “Doctor of Philosophy,” which refers to the immense knowledge a student gains when earning the degree. While you can actually get a PhD in philosophy, "Doctor of Philosophy" doesn't always refer to someone who has a terminal degree in that discipline. You can get a PhD in a number of fields, such as science or economics, and the word "Philosophy," translated from original Greek to mean "lover of wisdom," can refer to the degree holder's dedication to understanding a subject.

Students typically pursue a PhD when they're interested in an academic or research career—or if they want to take their education as far as it can go.

This article goes beyond the definition of a PhD, and touches on important information you’ll need to know about the degree, so you can decide whether pursuing one is the best choice for you. 

What is a PhD? 

A PhD is an academic degree that combines general knowledge of a field with specific mastery of an area of subtopic within that field. For example, earning your PhD in political science means you have a general foundation of the field, but likely also specialize in a more focused area, such as American or comparative politics, or political economy. 

PhDs—also known as doctorates—are terminal degrees , meaning they are the highest level of degree that you can achieve in certain fields, such as cognitive psychology, mathematics, English, economics, evolutionary biology, and public health. 

Read more: What Is a PhD?

What does it take to earn a PHD? 

PhD programs typically require you to complete advanced coursework, comprehensive exams that test your knowledge of your particular field of study, and a dissertation (or original body of research). The specific requirements will differ by program or university.  

How long does a PhD take?

Your PhD studies can take between four and seven years to complete, though it often depends on your field and other commitments. For example, it typically takes less than seven years to earn an engineering PhD, while it can take up to 12 years to earn an education PhD. Writing a dissertation is often credited with adding to the length of time it takes to complete a PhD program. In addition, some doctoral students may be working full-time or raising families while completing degree requirements, and thus may need additional time in their programs.

Learn more: How Long Does It Take to Get a PhD?

Build job-ready skills with a Coursera Plus subscription

• Get access to 7,000+ learning programs from world-class universities and companies, including Google, Yale, Salesforce, and more
• Try different courses and find your best fit at no additional cost
• Earn certificates for learning programs you complete
• A subscription price of $59/month, cancel anytime

Getting a PhD: what to know

If you're considering getting a PhD, there are some important aspects of doctoral degrees you'll need to know. 

To apply for PhD programs, you'll need to provide academic transcripts from your prior education, samples of your academic writing and research, and letters of recommendation from former professors. You will likely also need to write a personal statement that details your academic and professional goals, research interests, why you are applying to a particular program, relevant skills and experience, and strengths.  

Before applying, it's a good idea to research different education institutions to get an idea of their reputation, faculty achievements, mission statements, and the kinds of jobs former graduate students have gotten upon completing. 

Once enrolled in a doctoral program, expect to complete advanced study in your field. This will likely entail two years of coursework, conducting original research into a specific topic, navigating the world of academic publishing, and working closely with faculty to prepare for an academic or research-based career. 

Successful completion of a PhD program typically requires that you write a dissertation or conduct a significant research project on a specific topic related to your field. Most programs have students go through an oral defense to demonstrate mastery of the dissertation topic and describe its contribution to the field. 

PhDs vs. other terminal degrees

A PhD is not the only kind of terminal degree you can earn. In fact, there are two other types of terminal degrees that tend to be more career focused.

Professional doctorates

PhDs and professional doctorates are similar in that they are both the most advanced academic degrees you can earn, but a PhD requires a dissertation and a professional doctorate requires a doctoral study. 

PhDs are focused on producing original research, whereas professional doctorates typically have some professional experience they apply toward researching a solution to a practical problem. If you have significant experience in a professional field, such as business administration or public health, you might choose to pursue a professional doctorate because you can use your knowledge and expertise in more concrete ways. 

Professional degrees

A professional degree is the PhD equivalent for certain professions, like for a medical doctor, dentist, or lawyer. Whereas a PhD tends to promote a historical and theoretical education, a professional degree emphasizes a practical education because it’s designed for you to begin working in medicine or law after you graduate and pass additional licensing requirements. 

Did you know?

Honorary degrees at the PhD level are conferred upon people who've made significant contributions to a field or society at large. An "honorary" degree refers to an academic award that distinguished individuals can receive from an academic institution without having to complete the usual requirements of the degree. Here are some celebrity examples:

Meryl Streep has received honorary PhDs from Harvard, Yale, Princeton, and the University of Indiana at Bloomington for her cinematic achievements.

Oprah Winfrey has received honorary PhDs from Princeton, Howard University, Duke University, and Harvard for her philanthropic and business achievements.

John Legend has received honorary Doctorate of Music from the University of Pennsylvania and an honorary doctorate from Howard University.

Education requirements for a PhD 

Obtaining your PhD requires earning your bachelor’s degree and likely your master’s degree before you can begin applying to doctorate programs. However, there are some programs that combine the master’s degree with the PhD so that you spend less time earning both and can begin once you finish your bachelor’s degree. 

Let's look at the two most important degrees you’ll need to complete before you can begin pursuing your PhD.

Bachelor’s degree

You will need to earn a bachelor’s degree before pursuing more advanced degrees, like a master’s or PhD. You don’t have to choose a major related to your eventual doctorate, though it can help to pick a complementary subject so you have a strong foundation before taking higher-level coursework. For example, if you want to obtain a PhD in economics, then it might help to major in economics, finance, business, or even political science as an undergraduate. 

While graduate programs don’t always expect applicants to have studied the same field as the one they’re applying to, you will need to explain your interest in the field of your potential graduate work and have some knowledge about what you want to study within it. Aligning your undergraduate and graduate focuses may also help you move through your graduate coursework faster.  

Learn more: How to Get a Bachelor’s Degree

Master’s degree

A master’s degree is an advanced degree you can pursue after earning your undergraduate degree. PhD programs typically require a master’s before admitting you, though as we noted above, some programs may combine degree tracks to decrease the amount of time to completion.

Master’s degrees take between one and three years to finish , depending on whether you’re able to attend part-time or full-time. Master’s degrees enhance your level of expertise in your field, and you can pursue many higher-level careers with the credential—or continue with your education and apply to PhD programs. 

Learn more: Is a Master’s Degree Worth It?

4 benefits of a PhD 

There are a number of reasons why you might want to pursue your PhD. Let’s hone in on four of them: 

1. Become an expert.

People who obtain PhDs have the highest possible education in their field. As such, they're often considered to be genuine experts in that subject matter. You may feel a tremendous amount of personal satisfaction from having achieved this level of mastery.

2. Contribute original research. 

Adding to the knowledge of a particular field is no small feat. When you write your dissertation, you will have the opportunity to make a valuable original contribution that either expands people’s understanding of a subject or brings an entirely new perspective to it.

3. Broaden your job opportunities.

Earning a PhD could qualify you to work in academia or research, but it may also increase your qualifications—or help you stand out—for jobs that do not necessarily require a PhD. Holding a PhD may convey to employers that you’re knowledgeable, hardworking, and disciplined because of what it takes to earn the degree. 

4. Increase your salary potential.

On average, people with PhDs can potentially make more than those with undergraduate degrees, depending on your profession. The median weekly earnings of a person with a PhD in the United States is $1,885 compared to $1,305 for bachelor's degree holders [ 1 ]. A doctorate can also lead to higher lifetime earnings. A bachelor’s degree graduate will earn an average of $2.2 million over their lifetime, but PhD graduates earn an average of $4 million over their lifetimes [ 2 ].

Careers that typically require a PhD

A PhD is an academic credential necessary to teach at the university level or conduct high-level research in a number of fields, such as the life and social sciences. The following careers typically require a doctorate:

Research associate

Research scientist 

Assistant professor 

Dean of students

Careers where a PhD may help you advance  

While the careers listed below generally require a master’s degree, earning your PhD may help you qualify for more advanced roles within the profession—or help you develop more specialized knowledge to succeed in your career.  

Anthropologist 

Statistician 

Political scientist 

Psychologist 

Explore further

If you're contemplating getting your PhD and have not yet earned your master’s, explore a number of master’s degree options from prestigious universities in high-growth fields, such as computer science , business , management , or public health. Work toward your degree at your own pace from anywhere with an internet connection.

Article sources

US Bureau of Labor Statistics.S. Bureau of Labor Statistics. “ Education Pays, 2020 : Career Outlook , https://www.bls.gov/careeroutlook/2021/data-on-display/education-pays.htm." Accessed August 4, 2023.

Site Selection Magazine. " Education Level Is Only One Part of the Lifetime Earnings Picture , https://siteselection.com/cc/workforce/2022/education-level-is-only-one-part-of-the-lifetime-earnings-picture.cfm." Accessed August 4, 2023.

Keep reading

Coursera staff.

Editorial Team

Coursera’s editorial team is comprised of highly experienced professional editors, writers, and fact...

This content has been made available for informational purposes only. Learners are advised to conduct additional research to ensure that courses and other credentials pursued meet their personal, professional, and financial goals.

• To save this word, you'll need to log in. Log In

abbreviation or noun

Definition of phd, examples of phd in a sentence, word history.

New Latin philosophiae doctor

1839, in the meaning defined above

Dictionary Entries Near PhD

Cite this entry.

“PhD.” Merriam-Webster.com Dictionary , Merriam-Webster, https://www.merriam-webster.com/dictionary/PhD. Accessed 9 Nov. 2024.

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

Can you solve 4 words at once?

Word of the day.

See Definitions and Examples »

Get Word of the Day daily email!

Popular in Grammar & Usage

How to use em dashes (—), en dashes (–) , and hyphens (-), plural and possessive names: a guide, the difference between 'i.e.' and 'e.g.', why is '-ed' sometimes pronounced at the end of a word, what's the difference between 'fascism' and 'socialism', popular in wordplay, 8 words with fascinating histories, 8 words for lesser-known musical instruments, birds say the darndest things, 10 words from taylor swift songs (merriam's version), 10 scrabble words without any vowels, games & quizzes.

• Resources ›
• For Students and Parents ›
• Graduate School ›

A Doctor of Philosophy or Doctorate

• Choosing a Graduate Program
• Tips & Advice
• Admissions Essays
• Recommendation Letters
• Medical School Admissions
• Homework Help
• Private School
• College Admissions
• College Life
• Business School
• Distance Learning
• Ph.D., Developmental Psychology, Fordham University
• M.A., Developmental Psychology, Fordham University

More than 54,000 students earned doctoral degrees in 2016, the latest year for which figures are available, a 30 percent increase since 2000, according to the  National Science Foundation . A Ph.D., also called a doctorate, is a "Doctor of Philosophy" degree, which is a misleading moniker because most Ph.D. holders are not philosophers. The term for this increasingly popular degree derives from the original meaning of the word "philosophy," which comes from the ancient Greek word  philosophia , meaning "love of wisdom."

What Is a Ph.D.?

In that sense, the term "Ph.D." is accurate, because the degree has historically been a license to teach, but it also signifies that the holder is an "authority, in full command of (a given) subject right up to the boundaries of current knowledge, and able to extend them," says  FindAPhD , an online Ph.D. database. Earning a Ph.D. requires a hefty financial and time commitment— $35,000 to $60,000  and two to eight years—as well as research, creating a thesis or dissertation, and possibly some teaching duties.

Deciding to pursue a Ph.D. can represent a major life choice. Doctoral candidates require additional schooling after completing a master's program to earn their Ph.D.: They must complete additional coursework, pass comprehensive exams , and complete an independent dissertation in their field. Once completed, though, a doctoral degree—often called a "terminal degree"—can open doors for the Ph.D.holder, especially in academia but also in business.

Core Courses and Electives

To obtain a Ph.D., you need to take a group of core courses as well as electives, totaling about 60 to 62 "hours," which are roughly the equivalent of units at the bachelor's degree level. For example, Washington State University offers a  Ph.D. in crop science . Core courses, which make up about 18 hours, include such subjects as introduction to population genetics, plant transmission genetics, and plant breeding.

Additionally, the student must make up the remaining required hours through electives. The  Harvard T.H. Chan School of Public Health  offers a doctoral degree in Biological Sciences in Public Health. After core courses such as laboratory rotations, biological sciences seminars, and core principles of biostatistics and epidemiology, the Ph.D. candidate is required to take electives in related fields such as advanced respiratory physiology, advanced respiratory physiology, and ecological and epidemiological control of parasitic diseases. Degree-granting institutions across the board want to ensure that those who earn Ph.D.s have broad knowledge in their chosen field.

Thesis or Dissertation and Research

A Ph.D. also requires students to complete a large scholarly project known as a  dissertation , a research report—usually 60-plus pages—which signifies that they are able to make significant independent contributions to their chosen field of study. Students take on the project, also known as a  doctoral thesis , after completing the core and elective coursework and passing a  comprehensive examination . Through the dissertation, the student is expected to make a new and creative contribution to a field of study and to demonstrate her expertise.

According to the Association of American Medical Colleges, for example, a strong medical dissertation relies heavily on the creation of a specific hypothesis that can be either disproved or supported by data collected through independent student research. Further, it must also contain several key elements starting with an introduction to the problem statement, conceptual framework, and research question as well as references to literature already published on the topic. Students must show that the  dissertation  is relevant, provides new insight into the chosen field, and is a topic that they can research independently.

Financial Aid and Teaching

There are several ways to pay for a doctoral degree: scholarships, grants, fellowships, and government loans, as well as teaching.  GoGrad , a graduate school information website, provides such examples as the:

• Science, Mathematics, and Research for Transformation (SMART) Scholarship for Service Program, which provides full tuition and an annual stipend of $25,000 to $38,000.
• National Defense Science and Engineering Graduate Fellowship, a three-year graduate fellowship that is designed to support doctoral students across 15 engineering disciplines
• National Science Foundation Graduate Research Fellowship Program, a three-year program that provides an annual stipend of $34,000 and a $12,000 cost-of-education allowance for tuition and fees

As it does for bachelor's and master's degrees, the federal government also offers several  loan programs  to help students finance their Ph.D. studies. You generally apply for these loans by filling out the free application for federal student aid ( FAFSA ). Students planning to go into teaching after obtaining their doctoral degrees often also supplement their income by teaching undergraduate classes at the schools where they are studying. The University of California, Riverside, for example, offers a "teaching award"—essentially a stipend applied toward tuition costs—for Ph.D. candidates in English who teach undergraduate, beginning-level, English courses

Jobs and Opportunities for Ph.D. Holders

Education accounts for a large percentage doctoral awards, with elementary education, curriculum and instruction, educational leadership and administration, special education, and counselor education/ school counseling topping the list. Most universities in the United States require a Ph.D. for candidates who seek teaching positions, regardless of the department.

Many Ph.D. candidates seek the degree, however, to boost their current salaries. For example, a health, sports, and fitness educator at a community college would realize a bump in annual pay for obtaining a Ph.D. The same holds for educational administrators. Most such positions require only a master's degree, but obtaining a Ph.D. generally leads to an annual stipend that school districts add to the annual salary. That same health and fitness instructor at a community college could also move on from a teaching position and become a dean at a community college—a position that requires a Ph.D.—boosting his pay to  $120,000 to $160,000  a year or more.

So, the opportunities for a doctoral degree holder are wide and varied, but the cost and commitment required are significant. Most experts say you should know your future career plans before you make the commitment. If you know what you want to get out of the degree, then the years of required study and sleepless nights may well be worth the investment.

• Understanding the Definition of a Doctoral Candidate
• What is an Ed.D. Degree?
• Admissions Interview? Be Prepared to Interview with Graduate Students
• A Step-By-Step Guide to Writing a Ph.D. Dissertation
• Medical Schools in Virginia
• Medical Schools in Georgia
• What Comes After a Master's Degree?
• A Note About Masters and Doctoral Comprehensive Exams
• What Classes Will You Take in Medical School?
• How to Decide Between a Ph.D. or Psy.D. in Psychology
• How to Become a Doctor: Education and Career Path
• Degree Requirements for Therapists
• Top Medical Schools in California
• Should You Get a Recommendation for Grad School from Your Therapist?
• Applying to Graduate Programs in Clinical or Counseling Psychology
• Undergraduate Courses that Prepare You for Medical School