spectral line

spectral line   n.  An isolated bright or dark line in a spectrum produced by emission or absorption of light of a single wavelength.

Main Entry: spectral line
Function: noun
: one of a series of linear images of the narrow slit of a spectrograph or similar instrument corresponding to a component of thespectrum of the radiation emitted by a particular source

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.