Dictionary![]() ![]() cay•usePronunciation: (kī-yOOs', kī'OOs), [key] —n. 1. Western U.S.a horse, esp. an Indian pony. 2. Also called cayuse' wind'. Northwestern U.S.a cold wind blowing from the east. Cay•usePronunciation: (kī-yOOs', kī'OOs), [key] —n., —pl. -us•es, (esp. collectively) -use. a member of a tribe of North American Indians now living in Oregon. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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