how to abbreviate phd

PhD or Ph.D? Which is correct?

PhD and Ph.D are both correct ways to indicate the title, or honorific, of a doctor. However, Ph.D isn’t nearly as common as PhD. In fact, Ph.D is an old-fashioned method of writing it. But, there’s nothing wrong with using it that way. However, it’s more visually correct and recognizable in the modern world as PhD.

So, while there aren’t really any rules to remember for using PhD or Ph.D, it’s important to understand what it means. Plus the history of it will give you a little trivia.

Ph.D History

The earliest known documented use of Ph.D is from 1869. It’s an abbreviation of the Latin phrase, “Philosophiae Doctor” or “Doctor of Philosophy.” But “Philosophiae” has roots in ancient Greek, which translates into “love of wisdom.” To call someone a “doctor” is another way to say “learned person.”

The title PhD is the more common version in modern times and it means the same thing. These are people who receive doctorate degrees, which is the highest level of education someone can get. As it was back in 1869, the placement of the honorific can be before or after a name.

Examples of both PhD and Ph.D

The examples below show the myriad of ways in how to use and where to place PhD or Ph.D as an honorific for a person.

Dr. Ken Wellington, PhD

Professor Cynthia Kline, PhD

In many cases, doctors will have other degrees of study alongside their doctoral education. These additional honorifics indicate that.

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PhD, Ph.D., Dr.

In English, PhD can be written with or without periods; both are correct. The trend today is to drop periods with abbreviations of academic degrees. However, many sources, including the Canadian Oxford Dictionary , still recommend the use of periods: Ph.D.

When you are addressing a person with a doctoral degree, it is considered more polite to use the title Dr. or the academic abbreviation PhD with the person’s name, instead of the simple courtesy titles Mr. or Ms.

Note: Do not use both the title and the degree. If the degree is listed after the name, the title is not used before the name.

• Chris Cameron, PhD.
• Dr. Chris Cameron

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“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). 

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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! 

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Abbreviation of Doctor of Philosophy: PhD or DPhil?

I am a bit confused about the proper abbreviation of Doctor of Philosophy . I sometimes read that this person obtained his D.Phil from X University, while someone else obtained his PhD from Y University. According to Wikipidia :

The University of Oxford also abbreviates their Doctor of Philosophy degree as DPhil but in other respects is equivalent to a PhD.

Is it up to me to decide what abbreviation to use?

3 Answers 3

The awarding institution determines the abbreviation*; someone made a Doctor of Philosophy at Oxford is a DPhil, someone made a Doctor of Philosophy at Cambridge is a PhD, and someone made a Doctor of Philosophy at a university in Austria is a Dr.phil. (before the name, not after).

*At the time awarded, as pointed out in another answer.

Addendum: As Jack Orion points out, the abbreviation is of the Latin doctor philosophiae , which is why appears both ways around (Latin is more flexible in its word order than English). Many other degree abbreviations make their Latin origin more obvious (e.g. the MLitt for 'master of letters', magister litterarum ; the LLB for 'batchelor of laws', legium baccalaureatus , with conventional doubling of the 'L' to indicate the plural).

• 9 Nonsense - only Oprah makes Dr. Phils. ba dum bum –  corsiKa Commented Apr 7, 2014 at 17:52
• 1 Also note that even those of us who went only to Oxford (and so would have a DPhil if anything) will use "PhD" to mean a doctorate from an unspecified university. –  Steve Jessop Commented Apr 7, 2014 at 23:07

Neither D. Phil. nor Ph. D. are abbreviations for 'Doctor of Philosophy', but for 'Doctor Philosophiae' or 'Philosophiae Doctor' respectively. Sorry to be pedantic, but when this is realised it becomes easier to understand why the Ph. D. abbreviation exists at all.

• 3 Welcome Jack! This is a great, and very useful clarification, but is not really an answer to the question. Maybe leave something something like this as a comment next time? –  mako Commented Apr 7, 2014 at 19:31
• 7 I think this is an answer. If you point to a banana and ask me if it is an apple or an orange, I would answer your question by saying "Neither, it's a banana." –  Nobody Commented Apr 8, 2014 at 2:55
• "Doctor of Philosophy" and "Philosophy Doctor" are both valid translations for both of the Latin word arrangements. This is not a helpful answer. –  user23776 Commented Jul 12, 2015 at 7:28

No - it depends on the degree you were awarded.

Most universities offer PhD degrees, with a smaller subset (usually UK red-brick universities & Oxford) that offer DPhils. Some of the 'new' universities of the late 60s-early 70s used to offer DPhils. I was awarded a DPhil at Ulster, but subsequent to this, they switched to awarding PhDs.

• 5 "red-brick"...? –  Pete L. Clark Commented Apr 7, 2014 at 14:15
• 2 @PeteL.Clark I had also never heard of it but: en.wikipedia.org/wiki/Red_brick_university –  CTKlein Commented Apr 7, 2014 at 14:43

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How to use the PhD title and all the little doctorate “rules”… use ph.d etc the correct way.

There are many conventions in the academic world that can make it difficult to navigate the philosophiae doctor title. The PhD title is awarded to those who have completed a doctoral degree but, not many people know how to use it once they have it.

It’s best to use PhD not Ph.D in most cases!

This article will go through everything you need to know about using the PhD title and when you can start using it.

The “rules” are relatively simple and can be broken as they are not officially set in stone – other than when you can officially call yourself a doctor.

There is no one correct answer but it may be misleading if you use the PhD title incorrectly. Here are the recommendations for effective communication for a PhD graduate.

It very much depends on the setting. Here are some examples of how I would use both the titles awarded to me after my PhD degree.

How do you Write PhD correctly after a name? Is it ph d or phd and ph.d? Abbreviation explained

It can be confusing to know exactly how to write PhD after your name as a person with a doctoral degree. Which bits are capitalised for a person with a doctoral degree? Is there a ‘.’ In the middle?

When writing a name with a PhD after it, the correct way to do so is to use “PhD” or “Ph.D. or Ph D”

Depending on the preference of the individual, either form can be used.

However, if the individual has a business card that states their degree in full, then the more formal “Doctor of Philosophy” should be used.

It is important to note that using “PhD” without any periods is incorrect; this abbreviation should only be used in informal contexts such as emails or text messages. I tend to use PhD in my YouTube videos and some people have pointed out that this is incorrect…

Following the individual’s preferred format will ensure that their name and credentials are properly represented.

Should you use Dr as well as PhD?

Some people like to use Dr and PhD in their official titles. There are a couple of important points that you need to know about markers and academic titles.

• A person can have more than one marker in their name. For example my full title is Dr Andrew Stapleton, PhD, MChem.
• The doctor title at the front can be used as a variant to the PhD at the end.

It can be a little bit ambiguous if I was to use Dr Andrew Stapleton, PhD as there are two markers. This could mean that I have two PhD’s, it could mean that I have a PhD and a medical doctorate, or it could just be that I want to use both the doctor and the PhD tags for the one degree.

However, in my experience, I still like to use both the title of doctor at the front and the PhD tag at the end of my name for official purposes.

Academics would rarely use the PhD suffix in everyday communication. They would much rather just use the doctor title.

What is the proper title for a PhD with a doctorate degree?

The proper title for a PhD is Doctor of Philosophy. However, some teachers and professors like to be referred to without their official title.

If you are not sure about how your professor, lecturer, or friend with a PhD wishes to be officially addressed you can ask them.

Most of the time, I like to refer to my colleagues with their doctor title for official purposes, but I do not include the type of doctoral degree at the end of their name. That is much better suited to a business card.

Your lecture may wish to be referred to as:

• Dr [last name]
• Dr [first name]

Asking them in the early stages of your relationship is the best way to work out which one they prefer.

If in doubt, always go for the more formal name and nomenclature.

When can you start to use your PhD title after your doctorate? As a PhD student? After your phd thesis?

When you have earned your PhD, you, as a person with a doctoral degree, can start using your title immediately. Although, it can be a little bit confusing as to when you have actually passed your PhD. Is it when you have submitted your dissertation for the advanced degree? Is it when you have received the comments back?

The University of Adelaide says that you can use it from your conferral date:

Students can be conferred on one of five dates during the year and for PhD students the conferral date will be the first available following the completion of all the academic requirements of your degree, including final thesis lodgement and the disbursement of any outstanding financial obligations to the University.

I started using my PhD title as soon as my confirmation letter arrived at my house. It was the first letter from the University that referred to me as Dr Stapleton. I was incredibly excited.

Generally, it is acceptable to use the title “Dr.” both professionally and socially but socially, people very rarely use it – at least in Australia. But you should never use it if you are a PhD student, PhD candidate or enrolled in a PhD program without a previous PhD qualification. 

I do use it in professional settings but it always makes me feel a little bit awkward.

However, there may be some restrictions for certain settings . For example, if have a research degree resulting in a doctor title and you are working in a medical setting – some institutions do not like you to use Dr as it can confuse patients into thinking that you have a medical degree. 

Instead, they ask that you use the PhD tag at the end of your name rather than the doctoral title for official and professional communications.

What is the correct way to write PhD?

When writing about someone’s PhD, the correct way is to write the term in full and capitalize each letter.

This should be done for all academic degrees, not just PhDs.

For example, it would be “Doctor of Philosophy” or “PhD” instead of “Ph.D.”, “Dr.”, or “DPhil”.

Additionally, it is common to mention the field of study in which the degree was earned if known, such as “Doctor of Philosophy in Mathematics”. It is also good practice to include the institution that granted the degree if it is a recognized one.

When writing about someone’s PhD, use proper capitalization and include relevant information like field of study and institution if known to ensure accuracy.

How do you put a PhD in a title?

Putting a PhD in a title is not as complicated as it may sound.

Generally speaking, the proper way to list a PhD in an academic or professional setting is by writing “Dr.” before the name, followed by the person’s full name and the appropriate abbreviations for their degree.

For example, if John Smith has earned a doctorate in psychology, his credentials would be listed as “Dr. John Smith, Ph.D.”

In some cases, such as when addressing someone formally in speech or on a business card, it may also be acceptable to list their credentials as “John Smith, Ph.D.”

Depending on context and personal preference, some people may also choose to list their higher degrees after their names by writing out the entire degree instead of just its abbreviation.

For example, John Smith could choose to write his full title as “John Smith, Doctor of Psychology”

However, I have not seen this in real academic life.

Should the font size of Ph.D. be the same as someone’s name?

The question of whether the font size of a Ph.D. should be the same as someone’s name is an interesting one.

On one hand, it could be argued that the Ph.D. deserves to be highlighted and therefore should be given a larger font size than someone’s name to denote its importance.

On the other, it could be argued that this would not be necessary or appropriate, and that treating everyone equally regardless of their title or degree is more important.

It depends on context and usage – if both names appear in the same document then they should likely have the same font size; however, if one appears in a formal setting such as a diploma or certificate, then it may make sense to give it a larger font size than someone’s name to emphasize its importance and significance.

Ph.Ds (or PhDs) are an important academic achievement and should be respected accordingly but without going overboard by giving them overly large fonts sizes which can take away from rather than add to their importance.

Wrapping up – doctoral title rules

this article has been over everything you need to know that using the PhD title properly and effectively.

The doctor title can be used in place of the PhD and for incredibly formal communications, such as a business email or card, you can use both.

However, sometimes using both can cause confusion as to whether or not there is a reason first using both the doctor and PhD tags. Nonetheless, many people still use both.

Frequently Asked Questions about using PhD or Ph.d

1. what does phd stand for.

A PhD stands for Doctor of Philosophy , which is a doctoral degree that represents the highest level of academic achievement in a specific field of study.

2. Is Ph.d the same as PhD?

Yes, Ph.d is the abbreviation for Doctor of Philosophy , and both terms are used interchangeably to refer to the same academic degree .

3. Can I use the title ‘Doctor’ with a PhD?

Individuals who hold a PhD have the right to use the title “Doctor” in front of their name as they are a person with a doctoral degree .

4. What is the correct way to write PhD?

The correct way to write PhD is with no spaces and with both letters capitalized, following the standard abbreviation for Doctor of Philosophy .

5. How do I abbreviate Doctor of Philosophy?

You can abbreviate Doctor of Philosophy as PhD , which is the most commonly used abbreviation for this type of doctoral degree .

6. Can I use both the title ‘Dr.’ and ‘PhD’ together?

Yes, you can use both the title ‘Dr.’ and ‘PhD’ together to denote your academic achievement as a holder of a doctorate degree .

7. What is a dissertation in relation to a PhD?

A dissertation is a scholarly document that Ph.D candidates are required to submit as part of their research degree in a specific field.

8. Who is considered a PhD candidate?

A PhD candidate is a student enrolled in a PhD program working towards the completion of their doctoral studies.

9. Is a PhD also referred to as a Doctorate?

Yes, a PhD is also commonly referred to as a Doctorate , signifying the attainment of the highest

Dr Andrew Stapleton has a Masters and PhD in Chemistry from the UK and Australia. He has many years of research experience and has worked as a Postdoctoral Fellow and Associate at a number of Universities. Although having secured funding for his own research, he left academia to help others with his YouTube channel all about the inner workings of academia and how to make it work for you.

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When incorporating degree abbreviations in text, use PhD, EdD, MA, MS, BA, and BS with no periods. Generally use degree abbreviations instead of titles (use Jane Doe, PhD–not Dr. Jane Doe). Never use both the title and degree abbreviation (Dr. Jane Doe, PhD).

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Avoid shortening these academic terms whenever possible. Postgraduate, postdoctoral, and postbaccalaureate are preferred. When abbreviations are absolutely necessary, do not add a space or hyphen between elements in the compound.

Preferred: Postgraduate, postdoctoral, and postbaccalaureate Correct : Postgrad, postdoc, and postbacc Incorrect : Post-grad, post grad, post-doc, post doc, post-bacc, post bacc, post-bac, or post bac

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abbreviation or noun

Definition of phd, examples of phd in a sentence.

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'PhD.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

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 2 Aug. 2024.

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