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Definition of TAMARIN
: any of numerous small chiefly South American monkeys (genera Saguinus and Leontopithecus) that are related to the marmosets and have silky fur, a long tail, and lower canine teeth that are longer than the incisors
Any of about 25 species of long-tusked marmosets in the genera Leontopithecus (or Leontideus, according to some authorities) and Saguinus. Tamarins are 8–12 in. (20–30 cm) long, excluding the 12–16-in. (30–40-cm) tail. The emperor tamarin (Saguinus imperator) has long, grizzled, gray fur; a reddish tail, and a long white moustache. The three species of Leontopithecus are endangered. See alsogolden lion tamarin.