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

 

the troposphere

 noun
noun
BrE BrE//ˈtrɒpəsfɪə(r)//
 
; NAmE NAmE//ˈtroʊpəsfɪr//
 
, NAmE//ˈtrɑːpəsfɪr//
 
[singular](specialist) The Earth and the atmosphere
 
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the lowest layer of the earth’s atmosphere, between the surface of the earth and about 6–10 kilometres above the surface See related entries: The Earth and the atmosphere Word Origin early 20th cent.: from Greek tropos ‘turning’ + sphere.
See the Oxford Advanced American Dictionary entry: the troposphere