Marmoset \Mar"mo*set`\, n. [F. marmouset a grotesque figure, an ugly little boy, prob. fr. LL. marmoretum, fr. L. marmor marble. Perhaps confused with marmot. See Marble.]

(Zo["o]l.) Any one of numerous species of small South American monkeys of the genera Hapale and Midas, family Hapalid[ae]. They have long soft fur, and a hairy, nonprehensile tail. They are often kept as pets. Called also squirrel monkey.

Source: Webster's Revised Unabridged Dictionary (1913)