The Collaborative International Dictionary of English v.0.48:
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. [1913 Webster]WordNet (r) 3.0 (2006):
spectroscopic adj 1: of or relating to or involving spectroscopy; "spectroscopic analysis" [syn: spectroscopic, spectroscopical]