mesosphere

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mes·o·sphere / ˈmezəˌsfi(ə)r; ˈmē-/ • n. the region of the earth's atmosphere above the stratosphere and below the thermosphere, between about 30 and 50 miles (50 and 80 km) in altitude.DERIVATIVES: mes·o·spher·ic / ˌmezəˈsfi(ə)rik; ˌmē-/ adj.

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