/ Dictionary / Index U univalve: Meaning and Definition of Find definitions for: u•ni•valve Pronunciation: (y'nu-valv"), [key] — adj. —n. a univalve mollusk or its shell. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: univalve (Thesaurus) univalent univariate Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language