Exosphere Definition

ĕksō-sfîr
noun
The outermost region of a planet's atmosphere.
American Heritage
The outermost portion of a planet's, esp. the earth's, atmosphere, consisting of a hot layer of light atoms often moving at escape velocity.
Webster's New World

Other Word Forms of Exosphere

Noun

Singular:
exosphere
Plural:
exospheres

Origin of Exosphere

  • exo- +‎ -sphere

    From Wiktionary

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exosphere