brightline spectrum: Meaning and Definition of

bright'line spec'trum

Pronunciation: (brīt'līn"), [key]
— Physical Chem. Physical Chem.
  1. the spectrum of an incandescent substance appearing on a spectrogram as one or more bright lines against a dark background.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.