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[kee-muh-sfeer, kem-uh-] /ˈki məˌsfɪər, ˈkɛm ə-/

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.
(meteorol) a rare name for thermosphere


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    [kee-moh-ster-uh-luh nt, kem-oh-] /ˌki moʊˈstɛr ə lənt, ˌkɛm oʊ-/ noun 1. a chemical that causes an animal to become irreversibly sterile without changing its mating behavior or longevity.

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