1.  projector(n = noun.artifact) - an optical device for projecting a beam of light;
is a kind of optical device
Derived form noun projectionist₁

2.  projector(n = noun.artifact) - an optical instrument that projects an enlarged image onto a screen;
is a kind of optical instrument
has particulars: epidiascope, front projector, cine projector, film projector, movie projector, overhead projector, slide projector
Derived forms verb project₄, noun projectionist₁

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.]

projector, n.
1 a an apparatus containing a source of light and a system of lenses for projecting slides or film on to a screen. b an apparatus for projecting rays of light.
2 a person who forms or promotes a project.
3 archaic a promoter of speculative companies.

N  plan, scheme, design, project, proposal, proposition, suggestion, resolution, motion, precaution, deep- laid plan, system, organization, germ, sketch, skeleton, outline, draught, draft, ebauche, brouillon, rough cast, rough draft, draught copy, copy, proof, revise, drawing, scheme, schematic, graphic, chart, flow chart (representation), forecast, program, programme, prospectus, carte du pays, card, bill, protocol, order of the day, list of agenda, bill of fare, base of operations, platform, plank, slate, ticket, role, policy, contrivance, invention, expedient, receipt, nostrum, artifice, device, pipelaying, stratagem, trick, alternative, loophole, shift, last shift, measure, step, stroke, stroke of policy, master stroke, trump card, court card, cheval de bataille, great gun, coup, coup d'etat, clever stroke, bold stroke, good move, good hit, good stroke, bright thought, bright idea, intrigue, cabal, plot, conspiracy, complot, machination, subplot, underplot, counterplot, schemer, schemist, schematist, strategist, machinator, projector, artist, promoter, designer, conspirator, intrigant, planned, strategic, strategical, planning, prepared, in course of preparation, under consideration, on the tapis, on the carpet, on the floor.

cine projector, film projector, front projector, movie projector, overhead projector, slide projector