Definition of mesosphere noun from the Oxford Advanced Learner's Dictionary

 

mesosphere

 noun
noun
BrE BrE//ˈmezəsfɪə(r)//
 
; NAmE NAmE//ˈmezəsfɪr//
 
; BrE BrE//ˈmiːzəsfɪə(r)//
 
; NAmE NAmE//ˈmiːzəsfɪr//
 
[usually singular] The Earth and the atmosphere
 
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the part of the earth’s atmosphere which is between 50 and 80 kilometres from the ground, between the stratosphere and the thermosphere See related entries: The Earth and the atmosphere
See the Oxford Advanced American Dictionary entry: mesosphere