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exosphereOne entry found. Main Entry: exo·sphere Pronunciation: \ˈek-sō-ˌsfir\ Function: noun Etymology: International Scientific Vocabulary Date: 1949 : 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
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