mesopause

mesopause

[mez-uh-pawz, mes-, mee-zuh-, -suh-]
noun Meteorology.
1.
the boundary or transition zone between the mesosphere and the ionosphere. Compare mesosphere ( def 1 ).
2.
the top of the mesosphere, determined by the appearance of a temperature minimum near an altitude of 50 miles (80 km). Compare mesosphere ( def 2 ).

Origin:
1945–50; meso- + pause

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
mesopause (ˈmɛsəʊˌpɔːz)
 
n
meteorol the zone of minimum temperature between the mesosphere and the thermosphere

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
mesopause   (měz'ə-pôz')  Pronunciation Key 
The boundary between the upper mesosphere and the lower thermosphere, approximately 80 km (50 mi) above the Earth's surface. It is the site of the coldest temperatures in the Earth's atmosphere, with temperatures of -100°C (-148°F).
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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