mesosphere noun. ['mɛsǝ(ʊ)sfɪǝ, 'mɛz-, 'mi:s-, 'mi:z-] M20.
[from MESO- + -SPHERE.]
1. Meteorology. The layer of the earth's atmosphere above the stratopause and below the mesopause, in which temperature decreases with height. M20.
2. Geology. The lower layer of the earth's mantle, which is resistant to plastic flow and not involved in tectonic processes. M20.

■ mesospheric [mɛsǝ(ʊ)'sfɛrɪk, mɛz-, mi:s-, mi:z-] adjective of, pertaining to, or occurring in the mesosphere M20.

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