ionopause From WikiWord, the free dictionary English Contents DefinitionsRelated wordsReferences DefinitionsnounThe boundary layer of the ionosphere, where it meets the mesosphere or exosphere. Related wordsSynonymsstratopauseionospherethermopauseexospheremagnetopauseexopausehomosphereignorospheresurface boundary layerozonosphereturbopausefluctosphereactive frontplasmapausethermal lithospherecometopause References Wiktionary — ionopause Wikipedia — ionopause