Noun: ratite bird
- Flightless birds having flat breastbones lacking a keel for attachment of flight muscles: ostriches, cassowaries, emus, moas, rheas, kiwis, elephant birds
"The ostrich is the largest living ratite bird";
- ratite, flightless bird
Derived forms: ratite birds
Type of: bird, birdie [informal]
Antonym: carinate