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chemosphere

[kee-muh-sfeer, kem-uh-]
noun
  1. the region of the atmosphere most characterized by chemical, especially photochemical, activity, starting in the stratosphere and including the mesosphere and perhaps part of the thermosphere.
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Origin of chemosphere

First recorded in 1945–50; chemo- + -sphere
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for chemosphere

chemosphere

noun
  1. meteorol a rare name for thermosphere
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Derived Formschemospheric (ˌkɛməˈsfɛrɪk), adjective
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