projector

[pruh-jek-ter]
noun
1.
an apparatus for throwing an image on a screen, as a motion-picture projector or magic lantern.
2.
a device for projecting a beam of light.
3.
a person who forms projects or plans; schemer.

Origin:
1590–1600; project + -or2

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
projector (prəˈdʒɛktə)
 
n
1.  Full name: slide projector an optical instrument that projects an enlarged image of individual slides onto a screen or wall
2.  film projector, Full name: cine projector an optical instrument in which a strip of film is wound past a lens at a fixed speed so that the frames can be viewed as a continuously moving sequence on a screen or wall
3.  a device for projecting a light beam
4.  a person who devises projects

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Britannica
Encyclopedia

projector

device for transferring photographic and other images in an enlarged form onto a viewing screen. All types of projectors employ a light source and a lens system. A simple still-photo or slide projector for exhibiting transparencies has two sets of lenses, one between the light source and the transparency, to concentrate the light, and one in front of the transparency, to focus the picture on the screen and enlarge the image. Another type of still projector has the light source positioned in front of the picture so that the image is formed by light reflected from the picture; this produces a dimmer image but is necessary for the exhibition of opaque pictures-i.e., printed photographs and illustrations from books and magazines.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Up to this day it must be owned no projector has had the smallest success.
There's no reason they won't have a video camera located in a buttonhole, maybe
  even a video projector.
They have dozens of faces on the main projector screen.
They crouched behind anything they could find, even an overhead projector.
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