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chemosphere

American  
[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.

chemosphere British  
/ ˈkɛməˌsfɪə, ˌkɛməˈsfɛrɪk /

noun

  1. meteorol a rare name for thermosphere

"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

Other Word Forms

Etymology

Origin of chemosphere

First recorded in 1945–50; chemo- + -sphere

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.