mesopause

noun
me·so·pause | \ˈme-zə-ˌpȯz, ˈmē-, -sə-\

Definition of mesopause 

: the upper boundary of the mesosphere where the temperature of the atmosphere reaches its lowest point

First Known Use of mesopause

1950, in the meaning defined above

History and Etymology for mesopause

mesosphere + pause

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The first known use of mesopause was in 1950

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