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The Collaborative International Dictionary
Spectroscopically

Spectroscopic \Spec`tro*scop"ic\, Spectroscopical \Spec`tro*scop"ic*al\, a. Of or pertaining to a spectroscope, or spectroscopy. -- Spec`tro*scop"ic*al*ly, adv.

Wiktionary
spectroscopically

adv. 1 By means of a spectroscope 2 By the analysis of spectra

Usage examples of "spectroscopically".

Astronomers can spectroscopically identify a vast supergiant star which moves alternately nearer to and farther from Earth every few days.

Astronomers can spectroscopically identify a vast supergiant star which moves alternately nearer to and farther from Earth every few days.