(video games) A shoot 'em up game in which the player advances through a tube or tunnel while moving around its circumference.

(medicine) A kind of tube used for gastric lavage.

One of a number of tubes in a steam boiler through which heat, smoke and fumes from the firebox pass.

plural of tube train

(rail transport, UK) A smaller-profile underground train which operates through the tube tunnels under London, which have a small cross section.

(music) An experimental musical instrument consisting of a corrugated plastic tube or hose, open at both ends and possibly wider at one end, played by swinging it in a circle.

(obsolete) A Sarcocystis parasite.

(aviation, historical) A tube built into an aircraft allowing the crew to urinate while in flight.

The near vertical tube of the frame of a bicycle that supports the seat.

The horizontal tube of the diamond frame of a bicycle.