The Collaborative International Dictionary
yapack
Yapock \Ya"pock\ (?; 277), n. [Probably from the river Oyapok, between French Guiana and Brazil.] (Zo["o]l.) A South American aquatic opossum ( Chironectes variegatus) found in Guiana and Brazil. Its hind feet are webbed, and its fore feet do not have an opposable thumb for climbing. Called also water opossum. [Written also yapack.]