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:
thermospheres

Origin of Thermosphere

  • thermo- +"Ž -sphere

    From Wiktionary

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thermosphere