/ Dictionary / Index U unicuspid: Meaning and Definition of Find definitions for: u•ni•cus•pid Pronunciation: (y"ni-kus'pid), [key] — adj. having but one cusp. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: unicuspid (Thesaurus) unicostate unicycle Related Content Daily Word Quiz: fabricate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language