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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)