ionosphere

UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/aɪˈɒnəˌsfɪə/US:USA pronunciation: respellingUSA pronunciation: respelling(ī on′ə sfēr′)


WordReference Random House Unabridged Dictionary of American English © 2026
i•on•o•sphere  (ī on′ə sfēr′),USA pronunciation n. 
  1. Meteorologythe region of the earth's atmosphere between the stratosphere and the exosphere, consisting of several ionized layers and extending from about 50 to 250 mi. (80 to 400 km) above the surface of the earth.
  • 1925–30; iono- + -sphere
i•on•o•spher•ic  (ī on′ə sfer′ik),USA pronunciation adj. 
Collins Concise English Dictionary © HarperCollins Publishers::
ionosphere / aɪˈɒnəˌsfɪə/
  1. a region of the earth's atmosphere, extending from about 60 kilometres to 1000 km above the earth's surface, in which there is a high concentration of free electrons formed as a result of ionizing radiation entering the atmosphere from space
    See also D region, E region
ionospheric / aɪˌɒnəˈsfɛrɪk/
'ionosphere' also found in these entries (note: many are not synonyms or translations):
D layer - D region - E region - Heaviside layer - OGO - ariel - atmosphere - extraordinary wave - iono- - ionopause - magnetosphere - mesopause - mesosphere - neutrosphere - ordinary wave - skip distance - skip zone - sky wave - sphere

Forum discussions with the word(s) "ionosphere" in the title:


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