conduit consisting of a long hollow object (usually cylindrical) used to hold and conduct objects or liquids or gases | a tube of small internal diameter; holds liquid by capillary action |
an electric railway operating below the surface of the ground (usually in a city) | any of the minute blood vessels connecting arterioles with venules |
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 | |