GigantopithecusPronunciation: /dʒʌɪˌgantəˈpɪθɪkəs/Definition of Gigantopithecus noun a very large fossil Asian ape of the Upper Miocene to Lower Pleistocene epochs. Genus Gigantopithecus, family Pongidae Origin:modern Latin, from Greek gigas, gigant- (see giant) + pithēkos 'ape'Gigantopithecus in other Oxford dictionaries Definition of Gigantopithecus in the US English dictionary