U Very Common

a base containing nitrogen that is found in RNA (but not in DNA) and derived from pyrimidine; pairs with adenine

a heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons

the 21st letter of the Roman alphabet

The name of the Latin-script letter U .

A U-turn.

(chiefly British) of or appropriate to the upper classes especially in language use

Abbreviation of underwater.

Abbreviation of upper class (“characteristic of the upper classes, particularly in the use of language”).

The twenty-first letter of the English alphabet, called u and written in the Latin script.

you (in text messaging and internet conversations)

Abbreviation of under.

A language belonging to the Austroasiatic language family which is spoken in China.

Alternative form of Ü (“Tibetan language”)