/ Dictionary / Index M manganite: Meaning and Definition of Find definitions for: man•ga•nite Pronunciation: (mang'gu-nīt"), [key] — n. a gray to black mineral, hydrous manganese oxide, MnO(OH); gray manganese ore. any of a series of salts containing tetravalent manganese and derived from either of two acids, HMnO or HMnO. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: manganite (Thesaurus) Manganin manganous Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language