chemosphere

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

noun

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

meteorol a rare name for thermosphere

Derived Formschemospheric (ˌkɛməˈsfɛrɪk), adjective

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