#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 canal v. [canalize, canalise] provide (a city) with a canal. wn
#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 canal n. long and narrow strip of water made for boats or for irrigation. wn
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