definition of
canal

[1] #1 canal n. (astronomy) an indistinct surface feature of Mars once thought to be a system of channels; they are now believed to be an optical illusion. wn

[2] #2 canal v. [canalize, canalise] provide (a city) with a canal. wn

[3] #3 canal n. [duct, epithelial duct, channel] a bodily passage or tube lined with epithelial cells and conveying a secretion or other substance; "the tear duct was obstructed"; "the alimentary canal"; "poison is released through a channel in the snake's fangs". wn

[4] #4 canal n. long and narrow strip of water made for boats or for irrigation. wn