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M-line

[em-lahyn]
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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

m line in Medicine

M line

n.
  1. A fine dark band in the center of the H band in the myofibrils of striated muscle fibers.M band
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.