/ Dictionary / Index D dimenhydrinate: Meaning and Definition of Find definitions for: di•men•hy•dri•nate Pronunciation: (dī"men-hī'dru-nāt"), [key] — n. Pharm. a synthetic, crystalline, antihistamine powder, CHNO&multiplydot;CHClNO, used in the treatment of allergic disorders and as a preventive for seasickness and airsickness. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: dimenhydrinate (Thesaurus) dime bag dime novel Related Content Daily Word Quiz: digression Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language