/ Dictionary / Index V valentinite: Meaning and Definition of Find definitions for: val•en•tin•ite Pronunciation: (val'un-ti-nīt", -tē"nīt), [key] — n. a mineral, antimony trioxide, SbO, formed by the oxidation of various minerals containing antimony and occurring in the form of white orthorhombic crystals. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Valentinian III Valentino Related Content Daily Word Quiz: respite Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language