English

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

 

ionosphere

 noun
noun
BrE BrE//aɪˈɒnəsfɪə(r)//
 
; NAmE NAmE//aɪˈɑːnəsfɪr//
 
the ionosphere [singular] The Earth and the atmosphere
 
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a layer of the earth’s atmosphere between about 80 and 1 000 kilometres above the surface of the earth, that reflects radio waves around the earth compare stratosphere See related entries: The Earth and the atmosphere
See the Oxford Advanced American Dictionary entry: ionosphere