Radio. (of the two waves into which a radio wave is divided in the ionosphere under the influence of the earth's magnetic field) the wave with characteristics more nearly resembling those that the undivided wave would have exhibited in the absence of the magnetic field. Cf. extraordinary wave .
ORDINARY WAVE
Meaning of ORDINARY WAVE in English
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012