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.
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- spectra yellow,
- spectral class,
- spectral line,
- spectral luminous efficiency,
- spectral type,
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019