/ Dictionary / Index D DTP: Meaning and Definition of Find definitions for: DTP Pronunciation: [key] diphtheria, tetanus, and pertussis. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. D.Th. d.t.'s Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language