Duct

Duct
(Science: anatomy) a passage with well defined walls, especially a tube for the passage of excretions or secretions.
Synonym: ductus.
Origin: L. Ductus from ducere = to draw or lead
a continuous tube formed by a row of elongated cells lacking intervening end walls.An enclosed conduit for a fluid.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 snakes fangs.Tubes responsible for carrying liquids.