An arboreal anthropoid ape (Pongo pygmaeus, formerly Simia satyrus), which inhabits Borneo and Sumatra. Often called simply orang. It is now an endangered species. [1913 Webster]
, n. (also orang-outang) a large red long-haired tree-living ape, Pongo pygmaeus, native to Borneo and Sumatra, with characteristic long arms and hooked hands and feet.