Webster's English Dictionary

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rhea

rhea \'re--*\ n [NL, genus of birds, prob. fr. L Rhea, mother of Zeus, fr. 
   Gk] : any of several large tall flightless So. American birds (order 
   Rheiforme s) that resemble but are smaller than the African ostrich, have 
   three toes, a fully feathered head and neck, an undeveloped tail, and pale 
   gray to brownish feathers that droop over the rump and back