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Philosophiae Doctor; Ph.D. (s) (noun), Philosophiae Doctors (pl)
Doctor of philosophy: Mr. Smith received his Ph.D., or the title of a Philosophiae Doctor, after spending many years at the university, attaining a bachelor's degree with honours, a master's degree with a very high academic standing, and writing a thesis.
The average Ph.D. thesis is nothing but a transference of bones from one graveyard to another.
—J. Frank Dobie