The Collaborative International Dictionary
Spectroscopical
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
spectroscopical
a. (alternative form of spectroscopic English)
WordNet
spectroscopical
adj. of or relating to or involving spectroscopy; "spectroscospic analysis" [syn: spectroscopic]