1. (n.) Any tube or canal by which a fluid or other substance is conducted or conveyed.

2. (n.) One of the vessels of an animal body by which the products of glandular secretion are conveyed to their destination.

3. (n.) A large, elongated cell, either round or prismatic, usually found associated with woody fiber.

4. (n.) Guidance; direction.

Eustachian tube Fallopian tube adit aqueduct canal channel conduit course ditch egress emunctory entrance exit fistula ingress intestines meatus ostium oviduct passage passageway pore salpinx thoracic duct trench trough troughing troughway tunnel ureter urethra vagina vas vessel watercourse way