exosphere


exo·sphere

noun \ˈek-sō-ˌsfir\

Definition of EXOSPHERE

:  the outer fringe region of the atmosphere of the earth or a celestial body (as a planet)
exo·spher·ic \ˌek-sō-ˈsfir-ik, -ˈsfer-\ adjective

Origin of EXOSPHERE

International Scientific Vocabulary
First Known Use: 1949

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