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Related to mesosphere: thermosphere
The portion of the atmosphere from about 50 to 80 kilometers (31 to 50 miles) above the surface of the earth, characterized by temperatures that decrease from 10°C to -90°C (50°F to -130°F) with increasing altitude.
mes′o·spher′ic (-sfîr′ĭk, -sfĕr′-) adj.
1. (Physical Geography) the atmospheric layer lying between the stratosphere and the thermosphere, characterized by a rapid decrease in temperature with height
2. (Geological Science) the solid part of the earth's mantle lying between the asthenosphere and the core
mes•o•sphere(ˈmɛz əˌsfɪər, ˈmɛs-, ˈmi zə-, -sə-)
the region between the stratosphere and the thermosphere, extending from about 20 to 50 mi. (32–80 km) above the surface of the earth.
mes`o•spher′ic (-ˈsfɛr ɪk) adj.
The layer of the Earth's atmosphere lying above the stratosphere and below the thermosphere, from about 31 to 50 miles (50 to 80 kilometers) above the Earth's surface. In the mesosphere, temperatures decrease with increasing altitude.