Source : Webster's Revised Unabridged Dictionary (1913)

Gibbon \Gib"bon\, n. [Cf. F. gibbon.] (Zo["o]l.)
   Any arboreal ape of the genus {Hylobates}, of which many
   species and varieties inhabit the East Indies and Southern
   Asia. They are tailless and without cheek pouches, and have
   very long arms, adapted for climbing.

Source : WordNet®

Gibbon
     n 1: English historian best known for his history of the Roman
          Empire (1737-1794) [syn: {Edward Gibbon}]
     2: smallest and most perfectly anthropoid arboreal ape having
        long arms and no tail; of southern Asia and East Indies
        [syn: {Hylobates lar}]