family of the superfamily Hominoidea that includes the lesser apes, consisting of the gibbons and siamang.

( high-low-bat ah-day)The family that includes the gibbons and siamangs, the arboreal, so-called lesser apes of Southeast Asia. They are highly efficient brachiators.

used in some classifications for the lesser apes (gibbons and siamangs); sometimes considered a subfamily of Pongidae