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2017 Word of the Year

M-radiation

[em-rey-dee-ey-shuh n] /ˈɛmˌreɪ diˌeɪ ʃən/
noun, Physics.
1.
See under M-line.

M-line

[em-lahyn] /ˈɛmˌlaɪn/
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.
Origin of M-line
1920-1925
First recorded in 1920-25
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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