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. A long hollow object (usually cylindrical) used to hold and conduct liquids or gases; SYN. tubing.
2. A system of electrodes arranged in an evacuated glass or metal envelope; SYN. vacuum tube, thermionic vacuum tube, thermionic tube, electron tube, thermionic valve.
3. (Anatomy) Any hollow cylindrical body structure; SYN. tube-shaped structure.