Noun | 1. | family Callithricidae - marmosets mammal family - a family of mammals Platyrrhini, superfamily Platyrrhini - New World monkeys: capuchin; douroucouli; howler monkey; saki; spider monkey; squirrel monkey; titi; uakari; woolly monkey; marmoset; tamarin marmoset - small soft-furred South American and Central American monkey with claws instead of nails Callithrix, genus Callithrix - type genus of the Callithricidae: true marmosets Cebuella, genus Cebuella - pygmy marmosets |