Dictionary

ionosphere

noun ion·o·sphere \ī-ˈä-nə-ˌsfir\

Definition of IONOSPHERE

:  the part of the earth's atmosphere in which ionization of atmospheric gases affects the propagation of radio waves, which extends from about 30 miles (50 kilometers) to the exosphere, and which is contiguous with the upper portion of the mesosphere and the thermosphere; also :  a comparable region of charged particles surrounding another celestial body (as Venus)
ion·o·spher·ic \ˌī-ˌä-nə-ˈsfir-ik, -ˈsfer-\ adjective
ion·o·spher·i·cal·ly \-i-k(ə-)lē\ adverb

First Known Use of IONOSPHERE

1926

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