tropopause

[trop-uh-pawz, troh-puh-]

trop·o·pause

[trop-uh-pawz, troh-puh-]
noun Meteorology.
the boundary, or transitional layer, between the troposphere and the stratosphere.

Origin:
1915–20; tropo- + pause
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Tropopause is always a great word to know.
So is rain shadow. Does it mean:
a region in the lee of mountains that receives less rainfall than the region windward of the mountains
an area within which the air frequently is confined or channeled, with all parts of the area thus being subject to similar conditions of air pollution
Collins
World English Dictionary
tropopause (ˈtrɒpəˌpɔːz)
 
n
meteorol the plane of discontinuity between the troposphere and the stratosphere, characterized by a sharp change in the lapse rate and varying in altitude from about 18 km (11 miles) above the equator to 6 km (4 miles) at the Poles

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Science Dictionary
tropopause   (trō'pə-pôz', trŏp'ə-)  Pronunciation Key 
The boundary between the upper troposphere and the lower stratosphere, varying in altitude from about 8 km (5 mi) at the poles to 18 km (11 mi) at the equator.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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