a large, black gibbon, Hylobates syndactylus, of Sumatra and the Malay Peninsula, having very long arms and the second and third digits partially united by a web of skin: an endangered species.
a large black gibbon, Hylobates (or Symphalangus) syndactylus, of Sumatra and the Malay Peninsula, having a large reddish-brown vocal sac beneath the chin and the second and third toes united


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    adjective 1. of or relating to Siam, its people, or their language. 2. Thai (def 3). 3. twin; closely connected; similar. 4. Informal. dual; combined; twofold or two-way: a Siamese sprinkler. noun, plural Siamese. 5. a native of Siam. 6. Thai (def 2). 7. Siamese cat. 8. (usually lowercase) a standpipe placed outside a building […]

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