/ Dictionary / Index R rictus: Meaning and Definition of Find definitions for: ric•tus Pronunciation: (rik'tus), [key] — pl. -tus, -tus•es. the gape of the mouth of a bird. the gaping or opening of the mouth. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: rictus (Thesaurus) rictal bristle rid Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language