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upper atmosphere

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noun Meteorology.
  1. the portion of the atmosphere above the troposphere.
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Origin of upper atmosphere

First recorded in 1890–95
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words

lid, firmament, welkin, empyrean, azure, vault, heavens

British Dictionary definitions for upper atmosphere

upper atmosphere

noun
  1. meteorol that part of the atmosphere above the troposphere
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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

upper atmosphere in Science

upper atmosphere

  1. The part of the atmosphere above the troposphere. The upper atmosphere includes the mesosphere, the ionosphere, the thermosphere, and the exosphere. Temperatures in the upper atmosphere decrease with increasing altitude except in the thermosphere, where temperatures increase significantly with altitude, because the few molecules present receive intense solar radiation.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.