duct

Noun

• an enclosed conduit for a fluid

• a continuous tube formed by a row of elongated cells lacking intervening end walls

• 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
    

Related words

• Synonyms: 
  epithelial duct , canal , channel