Duct - Definition
duct
n 1: 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" [syn:
duct, epithelial duct, canal, channel]
2: a continuous tube formed by a row of elongated cells lacking
intervening end walls
3: an enclosed conduit for a fluid