Definition of mesosphere in US English:



  • The region of the earth's atmosphere above the stratosphere and below the thermosphere, between about 30 and 50 miles (50 and 80 km) in altitude.

    • ‘If the layers are characterized by the rate at which temperature changes with height, then the atmosphere is split into four layers: the troposphere, stratosphere, mesosphere, and thermosphere.’
    • ‘The best strategic course for the U.S. is to initiate a process that would affirm the use of space as a global commons where all guns are checked at the border of the mesosphere, 50 miles up.’
    • ‘Nacreous and Noctilucent clouds form not in the part of the atmosphere in which we live, but much higher up, in the stratosphere and mesosphere.’
    • ‘He looked up, as the light grey mesosphere melted away, revealing the inky blackness of space beyond.’
    • ‘They will also be able to find out more about the complex waves, tides and other mechanisms that link this region - known as the mesosphere - to the lower regions of the atmosphere.’