the two-toed sloth (Choloepus hoffmanni or C. didactylus) of South America
Origin of unauFrench ; from uncertain or unknown; perhaps
nounpl. u·naus also u·nais
Origin of unauPortuguese, from Tupí uná, lazy.
- Linnaeus's two-toed sloth, Choloepus didactylus, a two-toed sloth native to South America.