U·nau n.  Zool. The two-toed sloth (Cholopus didactylus), native of South America. It is about two feet long. Its color is a uniform grayish brown, sometimes with a reddish tint.
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  unau
       n 1: relatively small fast-moving sloth [syn: two-toed sloth, Choloepus
            hoffmanni]
       2: relatively small fast-moving sloth [syn: two-toed sloth, Choloepus
          didactylus]