Wa·ter o·pos·sum Zool. See Yapock, and the Note under Opossum.
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Ya·pock n. 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.]
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