Canal

n.
  1. An artificial channel filled with water and designed for navigation, or for irrigating land, etc.
  2. (Anat.) A tube or duct; as, the alimentary canal; the semicircular canals of the ear.
  3. A long and relatively narrow arm of the sea, approximately uniform in width; -- used chiefly in proper names; as, Portland Canal; Lynn Canal.
    4. Canal boat ,
    a boat for use on a canal; esp. one of peculiar shape, carrying freight, and drawn by horses walking on the towpath beside the canal.
    Canal lock .
    See Lock.