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chemosphere

[kee-muh-sfeer, kem-uh-] /ˈki məˌsfɪər, ˈkɛm ə-/
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
1945-1950
1945-50; chemo- + -sphere
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for chemosphere

chemosphere

/ˈkɛməˌsfɪə/
noun
1.
(meteorol) a rare name for thermosphere
Derived Forms
chemospheric (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
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