/ Dictionary / Index S smithsonite: Meaning and Definition of Find definitions for: smith•son•ite Pronunciation: (smith'su-nīt"), [key] — n. Mineral. a native carbonate of zinc, ZnCO, that is an important ore of the metal. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Smithsonian Institution Smithtown Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language