ETYM Latin ductus a leading, conducting, conduit, from ducere, ductum, to lead. Related to Duke, Douche.
1. A bodily passage or tube conveying a secretion or other substance; SYN. canal, channel.
2. A continuous tube formed by a row of elongated cells lacking intervening end walls.
3. An enclosed conduit for a fluid.

1. To enclose in a duct
2. To convey (as a gas) through a duct; also; to propagate (as radio waves) through a duct