/ Dictionary / Index D Dilantin: Meaning and Definition of Find definitions for: Di•lan•tin Pronunciation: (dī-lan'tn, -tin, di-), [key] — Pharm., Trademark. Pharm.,Trademark. a brand of diphenylhydantoin. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: dilantin (Thesaurus) dilaceration dilapidate Related Content Daily Word Quiz: reclusive Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language