The Collaborative International Dictionary
Stereoscopical
Stereoscopic \Ste`re*o*scop"ic\, Stereoscopical \Ste`re*o*scop"ic*al\, a. Of or pertaining to the stereoscope; characteristic of, or adapted to, the stereoscope; as, a stereoscopic effect; the stereoscopic function of the eyeglasses; stereoscopic views. -- Ste`re*o*scop"ic*al*ly, adv.
Wiktionary
stereoscopical
a. (alternative form of stereoscopic English)