order Rheiformes
Also found in: Thesaurus.
Related to order Rheiformes: Rheidae
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| Noun | 1. | order Rheiformes - a ratite bird order: birds intermediate in characteristics between ostriches and emus: recent and extinct rheas animal order - the order of animals Aves, class Aves - (ornithology) the class of birds family Rheidae, Rheidae - a family of birds coextensive with the order Rheiformes |
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