a line in a spectrum due to the absorption or emission of light at a discrete frequency.
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- spectra yellow,
- spectral class,
- spectral luminous efficiency,
- spectral series,
- spectral type,
Origin of spectral line
First recorded in 1865–70
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
[ spĕk′trəl ]
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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.