Tamarin definition

Any of various small, long-tailed, arboreal monkeys of the genera Leontopithecus and Saguinus of Central and South America, closely related to and resembling the marmosets but having a larger body, longer limbs, and lower canines that extend well beyond the incisors.

Any of several South American marmosets having long, silky fur, esp. any of a species (Saguinus tamarin) having black hands and feet.