mesosphere
me·so·sphere
noun \-ˌsfir\Definition of MESOSPHERE
: the part of the earth's atmosphere between the stratosphere and the thermosphere in which temperature decreases with altitude to the atmosphere's absolute minimum
— me·so·spher·ic \ˌme-zə-ˈsfir-ik, ˌmē-, -sə-, -ˈsfer-\ adjective
See First Known Use of MESOSPHERE
1950
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