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Origin of Ph.D.
From the Latin word Philosophiae Doctor Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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attested from 1869; abbreviation of Latin Philosophiae Doctor "Doctor of Philosophy."

Online Etymology Dictionary, © 2010 Douglas Harper
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ph.d in Medicine

Ph.D. abbr.
Latin Philosophiae Doctor (Doctor of Philosophy)

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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