Noun
used in some classifications for the lesser apes (gibbons and siamangs); sometimes considered a subfamily of Pongidae
Source: WordNetThe gibbons (family Hylobatidae) and then orangutans (genus Pongo) were the first groups to split from the line leading to the hominins, including humans—followed by gorillas, and, ultimately, by the chimpanzees (genus Pan). Source: Internet