Hylobates syndactylus hy·lo·ba·tessyndactylus uncommon noun 1. large black gibbon of Sumatra having the 2nd and 3rd toes partially united by a web SynonymssiamangHylobates syndactylusSymphalangus syndactylus Related words Broader terms lesser ape Parts Hylobates WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
