epidiascope(redirected from overhead projector)
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A projector by which images are reflected by a mirror through a lens, or lenses, onto a screen, using reflected light for opaque objects and transmitted light for translucent or transparent ones.
Synonym(s): overhead projector
[epi- + G. dia, through, + skopeō, to view]
A projector used to project by reflection opaque pictures (such as the page of a book) onto a screen.