any of a family (Callithricidae) of very small New World monkeys of South and Central America, with thick, soft, variously colored fur
See marmoset in American Heritage Dictionary 4
(märˈmə-sĕtˌ, -zĕtˌ)
noun
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.