u.s

(noun) North American republic containing 50 states - 48 conterminous states in North America plus Alaska in northwest North America and the Hawaiian Islands in the Pacific Ocean; achieved independence in 1776. Synonyms: United States, United States of America, America, the States, US, U.S., USA, U.S.A..

(noun) a base containing nitrogen that is found in RNA (but not in DNA) and derived from pyrimidine; pairs with adenine. Synonyms: uracil, U.

(noun) a heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons. Synonyms: uranium, U, atomic number 92.

(noun) the 21st letter of the Roman alphabet. Synonyms: U, u.