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arroyo

[uh-roi-oh] /əˈrɔɪ oʊ/
noun, plural arroyos.
1.
(chiefly in southwest U.S.) a small steep-sided watercourse or gulch with a nearly flat floor: usually dry except after heavy rains.
Origin
1800-1810
1800-10, Americanism; < Spanish; akin to Latin arrūgia mine shaft
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples for arroyo
  • My afternoon trek up the arroyo is rewarding as well.
  • arroyo's troops destroy everything but the mirrored ballroom of the hacienda.
British Dictionary definitions for arroyo

arroyo

/əˈrɔɪəʊ/
noun (mainly Southwestern US) (pl) -os
1.
a steep-sided stream bed that is usually dry except after heavy rain
Word Origin
C19: from Spanish

Arroyo

/əˈrɔɪjəʊ/
noun
1.
Gloria Macapagal. born 1947, Filipino stateswoman; vice-president of the Philippines (1998–2001); president (2001–10)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for arroyo
n.

"watercourse, dry streambed," 1845, a California word, from American Spanish, in Spanish, "rivulet, small stream," from Latin arrugia "shaft or pit in a gold mine," apparently a compound of ad- "to" (see ad-) + ruga "a wrinkle" (see rough (adj.)).

Online Etymology Dictionary, © 2010 Douglas Harper
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arroyo in Science
arroyo
  (ə-roi'ō)   
A small, deep gully or channel of an ephemeral stream. Arroyos usually have relatively flat floors and are flanked by steep sides consisting of unconsolidated sediments. They are usually dry except after heavy rainfall.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Article for arroyo

a dry channel lying in a semiarid or desert area and subject to flash flooding during seasonal or irregular rainstorms. Such transitory streams, rivers, or creeks are noted for their gullying effects and especially for their rapid rates of erosion, transportation, and deposition. There have been reports of up to 8 feet (2 m) of deposition in 60 years and like amounts of erosion during a single flood event

Learn more about arroyo with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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9
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