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


the thermosphere

BrE BrE//ˈθɜːməsfɪə(r)//
; NAmE NAmE//ˈθɜːrməsfɪr//
[singular] (specialist) The Earth and the atmosphere
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the region of the atmosphere above the mesosphere See related entries: The Earth and the atmosphere
See the Oxford Advanced American Dictionary entry: the thermosphere