Main Entry: me·so·sphere

Pronunciation: \-ˌsfir\

Function: noun

Date: 1950

: 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