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arroyo

ar·roy·o [ ə róy ō ] (plural ar·roy·os)


noun  Southwestern U.S. 
Definition:
 
1. dry gulch: a steep-sided dry gulch in a desert area that is wet only after heavy rain

2. stream: a small stream of running water

[Mid-19th century. Via Spanish< Latin arrugia "mineshaft"]
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