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n. pl. val·leys
1. An elongated lowland between ranges of mountains, hills, or other uplands, often having a river or stream running along the bottom.
2. An extensive area of land drained or irrigated by a river system.
3. A depression or hollow resembling or suggesting a valley, as the point at which the two slopes of a roof meet.
[Middle English valey, from Old French valee, from Vulgar Latin *vallāta, from Latin vallēs; see wel- in Indo-European roots.]
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) having a valley
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014