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.
Origin: 1350–1400; ME marmusette a kind of monkey, an idol < OF marmouset, appar. equiv. to marmos(er) to murmur (marm- (see marmot) + -oser v. suffix) + -et-et
mar·mo·set (mär'mə-sět', -zět') n. Any of various small clawed monkeys of the genera Callithrix and Cebuella, found in tropical forests of the Americas and having soft dense fur, tufted ears, and long tails.
[Middle English marmusette, a kind of small monkey, from Old French marmouset, grotesque figurine, alteration (influenced by marmouser, to murmur) of marmotte, marmot; see marmot.]
"small monkey," 1398, from O.Fr. marmouset "grotesque figurine" (1280), perhaps a variant of marmot "monkey, little child," from marmonner "to mutter, mumble," probably of imitative origin.