An optical device or projector used to display opaque images on a screen, or historically, a bishop's oversight or inspection.
From Greek epi- (upon, over) + skopein (to look, examine). The optical instrument uses the same root meaning 'to look over or examine' that gave us the original ecclesiastical sense of bishop.
The episcope projector was a classroom staple before digital projectors—it worked by shining light on an object and projecting the image, using the same 'looking down at' principle that a bishop does when overseeing a diocese.
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