either of two sloths of the genus Choloepus, having two claws on the forelimbs and three on the hind limbs, including C. didactylus and C. hoffmanni.
Origin of two-toed sloth
First recorded in 1765–75
Also called u·nau, u·nai [yoo-naw, oo-nou] /yuˈnɔ, uˈnaʊ/.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Word Origin for unau
C18: via French from Tupi
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012