{i} any of several small native South American monkeys (of the family Callithricidae) which are easily recognizable by their long silky coat and bushy tail
A marmoset is a type of small monkey. a type of small monkey with long hair and large eyes that lives in Central and South America (marmouset ). Any species of arboreal, diurnal, long-tailed South American monkey (family Callitrichidae) classified in two groups: eight species with short tusks (lower canine teeth), called marmosets, and 25 with long tusks, called tamarins. Marmosets move in a quick, jerky manner and eat insects and sometimes fruit and small animals. Members of the common marmoset genus Callithrix are 6-10 in. (15-25 cm) long, excluding the 10-16-in. (25-40-cm) tail. The dense, silky fur is white, reddish, or blackish; the ears are generally tufted. Marmosets have been kept as pets since the early 17th century