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

 

exosphere

 noun
noun
BrE BrE//ˈeksəʊsfɪə(r)//
 
; NAmE NAmE//ˈeksoʊsfɪr//
 
the exosphere[singular]
 
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the region near the edge of a planet’s atmosphere
See the Oxford Advanced American Dictionary entry: exosphere