projector

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A device for projecting a beam of light.
• noun A device that projects an image onto a screen or other surface.
• noun One who devises plans or projects.

from The Century Dictionary.

• noun In projective geometry: A projecting straight.
• noun A projecting plane.
• noun An eject.
• noun One who forms projects; one who forms a scheme or design; a schemer.
• noun That which projects; specifically, a parabolic mirror, or a lens or combination of lenses, used for projecting a beam of light.
• noun A camera for throwing an image on a screen by means of electric, magnesium, oxyhydrogen, or other suitable light.
• noun The square of the area of a plane triangle divided by the continued product of the sides.

from the GNU version of the Collaborative International Dictionary of English.

• noun One who projects a scheme or design; hence, one who forms fanciful or chimerical schemes.
• noun 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.
• noun a projector for displaying images from individual transparencies (slides), each mounted in a separate frame suited to the mechanics of the projector.
• noun 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.
• noun see projector{2}, above.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun An optical device that projects a beam of light, especially one used to project an image (or moving images) onto a screen.
• noun dated A person who devises or manages projects; a planner.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun an optical device for projecting a beam of light
• noun an optical instrument that projects an enlarged image onto a screen