Etymology
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canal (n.)

early 15c., in anatomy, "tubular passage in the body through which fluids or solids pass;" mid-15c., "a pipe for liquid;" from French canal, chanel "water channel, tube, pipe, gutter" (12c.), from Latin canalis "water pipe, groove, channel," noun use of adjective from canna "reed" (see cane (n.)). Sense transferred by 1670s to "artificial waterway for irrigation or navigation."

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Definitions of canal
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;
canal (n.)
a bodily passage or tube lined with epithelial cells and conveying a secretion or other substance;
the alimentary canal
Synonyms: duct / epithelial duct / channel
canal (n.)
long and narrow strip of water made for boats or for irrigation;
2
canal (v.)
provide (a city) with a canal;
Synonyms: canalize / canalise
From wordnet.princeton.edu