/hoh at"sin, waht"sin/ , n.
a blue-faced, crested bird, Opisthocomus hoazin, of the Amazon and Orinoco forests, having as a nestling a large, temporary claw on the second and third digits of the forelimb, for climbing among the tree branches.
Also, hoactzin .
[ 1655-65; huactzin, huahtzin name for several hen-sized birds of the Valley of Mexico, appar. applied indiscriminately by early naturalists to similar New World birds ]