ratite

from 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}]

from 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