The Collaborative International Dictionary of English v.0.48:

Ratite \Rat"ite\ (r[a^]t"[imac]t), a. (Zool.)
   Of or pertaining to the Ratitae. -- n. One of the Ratitae.
   [1913 Webster] Ratlines

WordNet (r) 3.0 (2006):

ratite
    n 1: flightless birds having flat breastbones lacking a keel for
         attachment of flight muscles: ostriches; cassowaries; emus;
         moas; rheas; kiwis; elephant birds [syn: ratite, ratite
         bird, flightless bird] [ant: carinate, carinate
         bird, flying bird]