Wordnet 3.0
NOUN (1)
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]
WordNet (r) 3.0 (2006):
flightless bird
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]