Hylobates syndactylus

from WordNet (r) 3.0 (2006)

Hylobates syndactylus
    n 1: large black gibbon of Sumatra having the 2nd and 3rd toes
         partially united by a web [syn: {siamang}, {Hylobates
         syndactylus}, {Symphalangus syndactylus}]

from The Collaborative International Dictionary of English v.0.48

Siamang \Si"a*mang`\, n. [Malay si[=a]mang.] (Zool.)
   A gibbon ({Hylobates syndactylus}), native of Sumatra. It has
   the second and third toes partially united by a web.
   [1913 Webster]

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