ratite
ra·tite
noun
1.
flightless birds having flat breastbones lacking a keel for attachment of flight muscles: ostriches; cassowaries; emus; moas; rheas; kiwis; elephant birds
Origin
From Latin ratis (“raft”) + -ite; ratites (unlike other birds) lack a keel on their sternum, and rafts are vessels that lack keels.
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Broader terms
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.