M-series

[em-seer-eez]

noun Physics.

See under M-line.

M-line

[em-lahyn]

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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019