Source : Webster's Revised Unabridged Dictionary (1913)

Crayon \Cray"on\ (kr?"?n), n. [F., a crayon, a lead pencil
   (crayon Cont['e] Cont['e]'s pencil, i. e., one made a black
   compound invented by Cont['e]), fr. craie chalk, L. creta;
   said to be, properly, Cretan earth, fr. Creta the island
   Crete. Cf. {Cretaceous}.]
   1. An implement for drawing, made of clay and plumbago, or of
      some preparation of chalk, usually sold in small prisms or
      cylinders.

            Let no day pass over you . . . without giving some
            strokes of the pencil or the crayon.  --Dryden.

   Note: The black crayon gives a deeper black than the lead
         pencil. This and the colored crayons are often called
         chalks. The red crayon is also called sanguine. See
         {Chalk}, and {Sanguine}.

   2. A crayon drawing.

   3. (Electricity) A pencil of carbon used in producing
      electric light.

   {Crayon board}, cardboard with a surface prepared for crayon
      drawing.

   {Crayon drawing}, the act or art of drawing with crayons; a
      drawing made with crayons.

Crayon \Cray"on\, v. t. [imp. & p. p. {Crayoned} (-?nd); p. pr.
   & vb. n. {Crayoning}.] [Cf. F. crayonner.]
   To sketch, as with a crayon; to sketch or plan.

         He soon afterwards composed that discourse, conformably
         to the plan which he had crayoned out.   --Malone.

Source : WordNet®

crayon
     n : writing implement consisting of a colored stick of
         composition wax used for writing and drawing [syn: {wax
         crayon}]
     v : write, draw, or trace with a crayon

Source : Free On-Line Dictionary of Computing

crayon
     
        1. Someone who works on {Cray} {supercomputer}s.  More
        specifically, it implies a programmer, probably of the {CDC}
        ilk, probably male, and almost certainly wearing a tie
        (irrespective of gender).  Systems types who have a {Unix}
        background tend not to be described as crayons.
     
        2. A {computron} that participates only in {number crunching}.
     
        3. A unit of computational power equal to that of a single
        {Cray-1}.  There is a standard joke about this usage that
        derives from an old Crayola crayon promotional gimmick: When
        you buy 64 crayons you get a free sharpener.
     
        [{Jargon File}]
     
        (1994-10-13)