(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.

(slang, vulgar) Of a man: to engage in penetrative vaginal sexual intercourse.

(obsolete) A Sarcocystis parasite.

Synonym of Miescher's tube

Alternative form of you can't put the toothpaste back in the tube

Once something is said or done, it cannot be unsaid or undone.

(chiefly Britain) Alternative spelling of tumor necrosis factor

plural of tumour necrosis factor

A sum of money paid for instruction (such as in a high school, boarding school, university, or college).