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 (synset 109255224)
  2. A bodily passage or tube lined with epithelial cells and conveying a secretion or other substance (synset 105258141)
    "the tear duct was obstructed"; "the alimentary canal"; "poison is released through a channel in the snake's fangs"
  3. Long and narrow strip of water made for boats or for irrigation (synset 102950684)
  1. Provide (a city) with a canal (synset 202341011)

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