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Related to bolson: xylophilous
n. Chiefly Southwestern US
A flat arid valley surrounded by mountains and draining into a shallow central lake.
[American Spanish bolsón, augmentative of Spanish bolsa, purse, pouch, from Late Latin bursa; see bursa.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Physical Geography) Southwestern US a desert valley surrounded by mountains, with a shallow lake at the centre
[C19: from American Spanish bolsón, from Spanish bolsa purse, from Late Latin bursa bag; see purse]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014