Source : Webster's Revised Unabridged Dictionary (1913)

Nandou \Nan"dou\, Nandu \Nan"du\, n. [Braz. nhandu or yandu.]
   (Zo["o]l.)
   Any one of three species of South American ostriches of the
   genera {Rhea} and {Pterocnemia}. See {Rhea}. [Written also
   {nandow}.]

Source : WordNet®

nandu
     n : smaller of two tall fast-running flightless birds similar to
         ostriches but three-toed; found from Peru to Strait of
         Magellan [syn: {rhea}, {Pterocnemia pennata}]