/ Dictionary / Index M marmoset: Meaning and Definition of Find definitions for: mar•mo•set Pronunciation: (mär'mu-zet", -set"), [key] — n. any of several small, squirrellike, South and Central American monkeys of the genera Callithrix, Leontocebus, etc., having soft fur and a long, nonprehensile tail: some species are endangered. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: marmoset (Thesaurus) marmoreal marmot Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language