/ Dictionary / Index M mangabey: Meaning and Definition of Find definitions for: man•ga•bey Pronunciation: (mang'gu-bā"), [key] — pl. -beys. any of several slender, long-tailed monkeys of the genus Cercocebus, inhabiting forests of Africa: some species are endangered. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: mangabey (Thesaurus) manful manganese Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language