| Definition of 'rheiformes' |
Princeton's WordNet |
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1. (noun) Rheiformes, order Rheiformes
a ratite bird order: birds intermediate in characteristics between ostriches and emus: recent and extinct rheas
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| Definition of 'rheiformes' |
U.S. National Library of Medicine |
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1. rheiformes
An order of large, long-necked, long-legged, flightless birds, found in South America. Known as rheas, they are sometimes called American ostriches, though they are in a separate order from true OSTRICHES.
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Definitions of rheiformes 
