Source : Webster's Revised Unabridged Dictionary (1913)

Colon \Co"lon\, n. [L. colon, colum, limb, member, the largest
   of the intestines, fr. Gr. ?, and in sense of the intestine,
   ?: cf. F. colon. Cf. {Colic}.]
   1. (Anat.) That part of the large intestines which extends
      from the c[ae]cum to the rectum.

   Note: [See Illust of {Digestion}.]

   2. (Gram.) A point or character, formed thus [:], used to
      separate parts of a sentence that are complete in
      themselves and nearly independent, often taking the place
      of a conjunction.

Source : WordNet®

colon
     n 1: the part of the large intestine between the cecum and the
          rectum; it extracts moisture from food residues before
          they are excreted
     2: the basic unit of money in El Salvador; equal to 100
        centavos [syn: {El Salvadoran colon}]
     3: the basic unit of money in Costa Rica; equal to 100 centimos
        [syn: {Costa Rican colon}]
     4: a port city at the Caribbean entrance to the Panama Canal
        [syn: {Aspinwall}]
     5: a punctuation mark (:) used after a word introducing a
        series or an example or an explanation (or after the
        salutation of a business letter)
     [also: {colones} (pl), {cola} (pl)]

Source : Free On-Line Dictionary of Computing

colon
     
         ":".  {ASCII} character 58.  Common names:
        {ITU-T}: colon.  Rare: dots; {INTERCAL}: two-spot.
     
        (1995-09-25)