Colon

n.
  1. (Anat.) That part of the large intestines which extends from the cæcum to the rectum. [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.

[See Illust. of Digestion.]