(sciences, engineering) A tube in the shape of a capital U, in certain applications having a semipermeable membrane in the middle.

The removable, light-emitting part of a fluorescent lamp

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

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

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

plural of tube train

(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.

A hypha produced by some fungi during germination

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

(obsolete) A Sarcocystis parasite.