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

the thermosphere

noun
 
/ðə ˈθɜːməsfɪə(r)/
 
/ðə ˈθɜːrməsfɪr/
[singular] (specialist)
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  1. the region of the atmosphere above the mesosphereTopics Spacec2
See the thermosphere in the Oxford Advanced American Dictionary
trait
noun
 
 
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