mesosphere[mes′ō sfir′, mez′-]
the atmospheric zone or shell located above the stratopause at an altitude of c. 55 to 80 km (c. 34 to 50 miles) and characterized by a decrease in temperature with increasing altitude
Origin of mesospheremeso- + sphere
The portion of the atmosphere from about 50 to 80 kilometers (31 to 50 miles) above the surface of the earth, characterized by temperatures that decrease from 10°C to −90°C (50°F to −130°F) with increasing altitude.
meso- +"Ž -sphere