tropopause

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

Origin:
1915–20; tropo- + pause

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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

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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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Example sentences
Jet streams form at the tropopause, the transitional region between the
  troposphere and the stratosphere.
The tropopause is typically highest at the equator and lowest near the poles.
Tropopause height is sensitive to temperature changes in the troposphere and
  stratosphere.
Warming the troposphere or cooling the stratosphere tends to increase
  tropopause height.
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