canal (
http://definr.com/canal)
n 1: (astronomy) an indistinct surface feature of Mars once
thought to be a system of channels; they are now
believed to be an optical illusion
2: a bodily passage or tube conveying a secretion or other
substance [syn:
duct,
channel]
3: long and narrow strip of water made for boats or for
irrigation
v : provide with a canal, as of a city [syn:
canalize,
canalise]