Any one of three species of large South American ostrichlike birds of the genera
Rhea and
Pterocnemia. Called also the
American ostrich. [
1913 Webster]
" The common rhea, or nandou (Rhea Americana), ranges from Brazil to Patagonia. Darwin's rhea (Pterocnemia Darwinii), of Patagonia, is smaller, and has the legs feathered below the knee."
[1913 Webster]