Source : Webster's Revised Unabridged Dictionary (1913)

Ratite \Rat"ite\, a. (Zo["o]l.)
   Of or pertaining to the Ratit[ae]. -- n. One of the
   Ratit[ae].

Source : WordNet®

ratite
     n : flightless birds having flat breastbones lacking a keel for
         attachment of flight muscles: ostriches; cassowaries;
         emus; moas; rheas; kiwis; elephant birds [syn: {ratite
         bird}, {flightless bird}] [ant: {carinate}]