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M-radiation

[em-rey-dee-ey-shuh n]
noun Physics.
  1. See under M-line.
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M-line

[em-lahyn]
noun Physics.
  1. 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.
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Origin of M-line

First recorded in 1920–25
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018