overhead projector

overhead projector
Projector Pro*ject"or, n. [Cf. F. projeteur.] 1. One who projects a scheme or design; hence, one who forms fanciful or chimerical schemes. --L'Estrange. [1913 Webster]

2. an optical instrument which projects an image from a transparency or an opaque image onto a projection screen or other surface, using an intense light and one or more lenses to focus the image. The term projector by itself is usually used for projection of transparent images by passing the light beam through the image; a projector which projects an image of an opaque object is now ususally referred to as an {overhead projector}. In projection of this latter form the projection is accomplished by means of a combination of lenses with a prism and a mirror or reflector. Specific instruments have been called by different names, such as {balopticon}, {radiopticon}, {radiopticon}, {mirrorscope}, etc. [Webster 1913 Suppl. +PJC]

{Slide projector} a projector for displaying images from individual transparencies (slides), each mounted in a separate frame suited to the mechanics of the projector.

{movie projector} a projector which displays a series of images from a roll of transparent film in rapid sucession, thus giving the impression of showing a scene with motion as it originally was recorded.

{overhead projector} see {projector[2]}, above. --> [PJC]


The Collaborative International Dictionary of English. 2000.

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  • Overhead projector — in operation during a classroom lesson An overhead projector is a variant of slide projector that is used to display images to an audience. Contents 1 Mechanism …   Wikipedia

  • overhead projector — Projector Pro*ject or, n. [Cf. F. projeteur.] 1. One who projects a scheme or design; hence, one who forms fanciful or chimerical schemes. L Estrange. [1913 Webster] 2. an optical instrument which projects an image from a transparency or an… …   The Collaborative International Dictionary of English

  • overhead projector — over‧head pro‧jec‧tor ➔ projector * * * overhead projector UK US noun [C] (ABBREVIATION OHP, also projector) ► WORKPLACE, MEETINGS a piece of equipment that shines images from a flat transparent sheet onto a white screen or wall: » …   Financial and business terms

  • overhead projector — ☆ overhead projector n. a projector having a flat, transparent top on which a sheetlike transparency is placed, and an overhead mirror that reflects the image on the transparency to a screen * * * …   Universalium

  • overhead projector — ☆ overhead projector n. a projector having a flat, transparent top on which a sheetlike transparency is placed, and an overhead mirror that reflects the image on the transparency to a screen …   English World dictionary

  • overhead projector — overhead projectors N COUNT An overhead projector is a machine that has a light inside it and makes the writing or pictures on a sheet of plastic appear on a screen or wall. The abbreviation OHP is also used. Syn: OHP …   English dictionary

  • overhead projector — ► NOUN ▪ a device that projects an enlarged image of a transparency by means of an overhead mirror …   English terms dictionary

  • overhead projector — noun a projector operated by a speaker; projects the image over the speaker s head • Hypernyms: ↑projector * * * noun, pl ⋯ tors [count] : a device that shows information or pictures on a wall or screen by shining a light through a sheet with the …   Useful english dictionary

  • overhead projector — UK / US noun [countable] Word forms overhead projector : singular overhead projector plural overhead projectors a piece of equipment that uses a light to make the words or pictures on a transparent plastic sheet appear large on a screen …   English dictionary

  • overhead projector — overhead pro jector n OHP a piece of electrical equipment used when giving a talk, which shows words or pictures on a wall or large screen so that many people can see them …   Dictionary of contemporary English

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