spectral line

noun Optics.
a line in a spectrum due to the absorption or emission of light at a discrete frequency.

Origin:
1865–70

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Science Dictionary
spectral line   (spěk'trəl)  Pronunciation Key 
An isolated bright or dark line in a spectrograph produced by emission or absorption of light of a single wavelength, generally corresponding to a specific shift in the energy of an electron moving from one orbital to another.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Increasing temperature will increase the width of a spectral line but won't increase the intensity.
The element was named after the beautiful green spectral line, which identified the element.
The wavelength and spectral line width selections shall be based on both the transmitter and the receiver design.
The diagram below shows the characteristic spectral line patterns of four elements.
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