adjective.
Relating to or being any of a group of flightless birds having a flat breastbone without the keellike prominence characteristic of most flying birds.
noun.
A ratite bird, such as the ostrich or emu.
The Century Dictionary and Cyclopedia
Raft-breasted, as a bird; having a flat breast-bone or sternum with no keel; having no keel, as a breast-bone; ecarinate; of or pertaining to the.
the GNU version of the Collaborative International Dictionary of English
noun.
A bird of the order of Struthioniformes, a diverse group of large running, flightlessbirds, mostly extinct, but including the cassowary, elephant bird, emu, kiwi, moa, ostrich, rhea and tinamou
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
flightless birds having flat breastbones lacking a keel for attachment of flight muscles: ostriches; cassowaries; emus; moas; rheas; kiwis; elephant birds