/ Dictionary / Index D DPT: Meaning and Definition of Find definitions for: DPT Pronunciation: [key] diphtheria, pertussis, and tetanus: a mixed vaccine of formalin-inactivated diphtheria and tetanus toxoids and pertussis vaccine, used for primary immunization. dpt. Pronunciation: [key] department. deponent. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. D.P.S. D.P.W. Related Content Daily Word Quiz: reiterate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language