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chemosphere

[kee-muh-sfeer, kem-uh-]
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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.

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
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