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|Noun||1.||Rhea americana - larger of two tall fast-running flightless birds similar to ostriches but three-toed; found from Brazil to Patagonia|
flightless bird, ratite, ratite bird - flightless birds having flat breastbones lacking a keel for attachment of flight muscles: ostriches; cassowaries; emus; moas; rheas; kiwis; elephant birds
genus Rhea - type genus of the Rheidae; large tall flightless South American birds similar to but smaller than ostriches
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