epidiascope

n.
A machine for projecting the images of opaque objects or transparencies on a screen.

[EPI- + DIA- + -SCOPE.]

Diascope is another name for a transparency projector. Episcope is the corresponding name for an opaque projector, which images the light reflected from a document or small object on to a screen. An epidiascope combines both functions. Because of its optical inefficiency an episcope needs a powerful light source and a wide-aperture lens. As the type of illumination is inappropriate for transparencies, some epidiascopes have a lever mechanism to realign the light source for slide projection. Epidiascopes are cumbersome devices, and are being largely supplanted by scanning systems linked to projectors of LCD arrays.

— Graham Saxby

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The noun has one meaning:

Meaning #1: a projector for images for both transparent and opaque objects

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