/ Dictionary / Index G grimace: Meaning and Definition of Find definitions for: grim•ace Pronunciation: (grim'us, gri-mās'), [key] — n., v., -aced, -ac•ing. —n. a facial expression, often ugly or contorted, that indicates disapproval, pain, etc. —v.i. to make grimaces. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: grimace (Thesaurus) grim Grimaldi Related Content Daily Word Quiz: stringent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language