Si·a·mang n. Zool. A gibbon (Hylobates syndactylus), native of Sumatra. It has the second and third toes partially united by a web.
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Hylobates syndactylus
n : large black gibbon of Sumatra having the 2nd and 3rd toes
partially united by a web [syn: siamang, Symphalangus
syndactylus]