a. [ Gr. &unr_; shadow + &unr_; belonging to sight: cf. F. scioptique. See Optic. ] (Opt.) Of or pertaining to an optical arrangement for forming images in a darkened room, usually called scioptic ball. [ 1913 Webster ]

Scioptic ball (Opt.), the lens of a camera obscura mounted in a wooden ball which fits a socket in a window shutter so as to be readily turned, like the eye, to different parts of the landscape. [ 1913 Webster ]

n. [ NL. See Scioptic. ] A kind of magic lantern. [ 1913 Webster ]

n. The art or process of exhibiting luminous images, especially those of external objects, in a darkened room, by arrangements of lenses or mirrors. [ 1913 Webster ]