e region erector spinae • erelong · · · Info · Definitions · Characters · · e region · · Text Common · · Latin · · Scripts 8 · · Length 3 · · Syllables Definitions · · · (noun) a region of the ionosphere (from 50 to 90 miles up) that reflects radio waves of medium length. Synonyms: Heaviside layer, Kennelly-Heaviside layer, E layer, E region. · · Noun Definition 1 Characters · · space U+0020 e latin small letter e U+0065 g latin small letter g U+0067 i latin small letter i U+0069 n latin small letter n U+006E o latin small letter o U+006F r latin small letter r U+0072