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From The Collaborative International Dictionary of English v.0.48:
Yapock \Ya"pock\ (?; 277), n. [Probably from the river Oyapok, between French Guiana and Brazil.] (Zool.) 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.] [1913 Webster] [1913 Webster]