Etymology
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rhea (n.)

three-toed South American ostrich, 1801, Modern Latin genus name, for unknown reasons from Greek Rhea, the name of a titaness, wife and sister of Kronos, mother of Zeus, etc.; a name of unknown origin. Her name also was given to a moon of Saturn discovered in 1672.

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Definitions of rhea
1
rhea (n.)
smaller of two tall fast-running flightless birds similar to ostriches but three-toed; found from Peru to Strait of Magellan;
Synonyms: nandu / Pterocnemia pennata
rhea (n.)
larger of two tall fast-running flightless birds similar to ostriches but three-toed; found from Brazil to Patagonia;
Synonyms: Rhea americana
2
Rhea (n.)
fertility goddess in ancient Greek mythology; wife of Cronus and mother of Zeus; identified with Roman Ops and Cybele of ancient Asia Minor;
From wordnet.princeton.edu