Noun | 1. | family Hylobatidae - used in some classifications for the lesser apes (gibbons and siamangs); sometimes considered a subfamily of Pongidae mammal family - a family of mammals Anthropoidea, suborder Anthropoidea - monkeys; apes; hominids lesser ape - gibbons and siamangs genus Hylobates, Hylobates - gibbons genus Symphalangus, Symphalangus - used in some classifications for the siamangs |