Ionosphere Definition

ī-ŏnə-sfîr
noun
The outer part of the earth's atmosphere, beginning at an altitude of c. 55 km (c. 34 mi) and extending to the highest parts of the atmosphere: it contains several regions that consist of a series of constantly changing layers characterized by an appreciable electron and ion content.
Webster's New World
The similar region of the atmosphere of another planet.
Wiktionary

Other Word Forms of Ionosphere

Noun

Singular:
ionosphere
Plural:
ionospheres

Origin of Ionosphere

  • iono- +‎ -sphere

    From Wiktionary

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ionosphere