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mesopause

[mez-uh-pawz, mes-, mee-zuh-, -suh-] /ˈmɛz əˌpɔz, ˈmɛs-, ˈmi zə-, -sə-/
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
1945-1950
1945-50; meso- + pause
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for mesopause

mesopause

/ˈmɛsəʊˌpɔːz/
noun
1.
(meteorol) the zone of minimum temperature between the mesosphere and the thermosphere
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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mesopause in Science
mesopause
  (měz'ə-pôz')   
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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