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Dictionary

spec'tral se'ries

Physics.
a series of lines in the spectrum of light emitted by excited atoms of an element, each line being related to the others in the series by a simple numerical equation and identified with a particular energy level of an atom of the element.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

spectral line

spectral type

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