conduit consisting of a long hollow object (usually cylindrical) used to hold and conduct objects or liquids or gases | a tubular organ in an aquatic animal (especially in mollusks) through which water can be taken in or expelled |
an electric railway operating below the surface of the ground (usually in a city) | a tube running from the liquid in a vessel to a lower level outside the vessel so that gravity forces the liquid through the tube |
electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope | |
(anatomy) any hollow cylindrical body structure | |
a hollow cylindrical shape | |