1. (

• duct ,
• epithelial_duct ,
• canal ,
• 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" ;

2. (

• duct

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

3. (

• duct

) an enclosed conduit for a fluid ;