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