[1] : The Collaborative International Dictionary of English v.0.48

projector \project"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 projector2, above. -->
      pjc
see also:
overhead projector balopticon radiopticon mirrorscope slide projector movie projector 
projector2 

[2] : WordNet (r) 2.0

overhead projector
     n : a projector operated by a speaker; projects the image over
         the speaker's head

Overhead >> O Words
Overhead, definition of term: Overhead
overhead_pag1.html

Projector >> P Words
Projector, definition of term: Projector
projector_pag1.html

Overhead Projec >> O Words
Overhead Projec, definition of term: Overhead Projec
overhead+projec_pag1.html

Overhead Railwa >> O Words
Overhead Railwa, definition of term: Overhead Railwa
overhead+railwa_pag1.html