1. 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"
  2. A continuous tube formed by a row of elongated cells lacking intervening end walls (synset 113111816)
  3. An enclosed conduit for a fluid (synset 103258101)

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