Dictionary![]() ![]() M-linePronunciation: (em'līn"), [key] —n. Physics. one of a series of lines (M-series) in the x-ray spectrum of an atom corresponding to radiation (M-radiation) caused by the transition of an electron to the M-shell. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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