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:
thermosphere
Plural:
thermospheresOrigin of Thermosphere
thermo- +"Ž -sphere
From Wiktionary
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