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[em-lahyn] /ˈɛmˌlaɪn/
noun, 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.
Origin of M-line
First recorded in 1920-25 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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m line in Medicine

M line n.
A fine dark band in the center of the H band in the myofibrils of striated muscle fibers. Also called M band.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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