spectral-line

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.
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