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spectral line

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

First recorded in 1865–70
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
spectral line in Science

spectral line

[spĕk′trəl]
  1. 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.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.