Rhea \Rhe"a\, n. [L., a proper name.] (Zool.)
Any one of three species of large South American ostrichlike
birds of the genera {Rhea} and {Pterocnemia}. Called also the
{American ostrich}.
[1913 Webster]
Note: 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]