rain-shadow

rain shadow

noun Meteorology.
a region in the lee of mountains that receives less rainfall than the region windward of the mountains.

Origin:
1900–05

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Collins
World English Dictionary
rain shadow
 
n
the relatively dry area on the leeward side of high ground in the path of rain-bearing winds

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Science Dictionary
rain shadow  
An area having relatively little precipitation due to the effect of a topographic barrier, especially a mountain range, that causes the prevailing winds to lose their moisture on the windward side, causing the leeward side to be dry.
The American Heritage® Science Dictionary
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