/ Dictionary / Index M manganous: Meaning and Definition of Find definitions for: man•ga•nous Pronunciation: (mang'gu-nus, man-gan'us, mang-), [key] — adj. Chem. containing bivalent manganese. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. manganite manganous sulfate Related Content Daily Word Quiz: tactful Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language