Thermosphere Definition
 thûrmə-sfîr 
    noun
  
 The atmospheric zone or shell located above the mesopause beginning at an altitude of c. 85 km (53 mi) and characterized by a great rise in temperature with increasing altitude.
 Webster's New World 
Other Word Forms of Thermosphere
Noun
Singular:
 thermospherePlural:
 thermospheresOrigin of Thermosphere
- thermo- +"Ž -sphere - From Wiktionary 
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