| overhead projector | <instrument> 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: overhead projector. Origin: epi-+ G. Dia, through, + skopeo, to view (05 Mar 2000) |
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| projector | One who projects a scheme or design; hence, one who forms fanciful or chimerical schemes. An optical instrument which projects an image from a transparency onto a projection screen or other surface, using an intense light and one or more lenses to focus the image. Slide projector; movie projector. Overhead projector. Origin: Cf. F. Projeteur. Source: Websters Dictionary (01 Mar 1998) |
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| overhead cover | Material (organic or inorganic) that provides protection to fish or other aquatic animals from above, generally includes material overhanging the stream less than a particular distance above the water surface. Values less than 0.5 m (1.5 feet) and less than 1 m (3 feet) have been used. (09 Oct 1997) |