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- Dictionaryar·roy·o/əˈroiˌ(y)ō/
noun
- 1. a steep-sided gully formed by the action of fast-flowing water in an arid or semi-arid region, found chiefly in the southwestern US.
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noun
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Dry creek or stream bed which temporarily or seasonally fills and flows after sufficient rain
An arroyo, from Spanish arroyo, also called a wash, is a dry watercourse that temporarily or seasonally fills and flows after sufficient rain. Flash floods are common in arroyos following thunderstorms. Wikipedia