/ Dictionary / Index M mannose: Meaning and Definition of Find definitions for: man•nose Pronunciation: (man'ōs), [key] — n. Chem. a hexose, CHO, obtained from the hydrolysis of the ivory nut and yielding mannitol upon reduction. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. mannitol hexanitrate Manny Related Content Daily Word Quiz: mamba Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language