thermosphere

(t̸hʉrmə sfir′)

noun

the atmospheric zone or shell located above the mesopause beginning at an altitude of c. 85 km (53 mi) and characterized by a great rise in temperature with increasing altitude

See thermosphere in American Heritage Dictionary 4

noun
The outermost shell of the atmosphere, between the mesosphere and outer space, where temperatures increase steadily with altitude.

Related Forms:

  • therˌmo·spherˈic (-sfîrˈĭk, -sfĕrˈĭk) adjective

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