noun Physical Chemistry.
the spectrum of an incandescent substance appearing on a spectrogram as one or more bright lines against a dark background.
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- bright-line spectrum,
- brightening agent,
- brighton and hove,
Origin of brightline spectrum
First recorded in 1885–90
Also called brightline.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019