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
Synonyms
United States
United States of America
America
the States
U.S.
USA
U.S.A.
Examples
- achieved independence in 1776
noun
a base containing nitrogen that is found in RNA (but not in DNA) and derived from pyrimidine
Synonyms
Examples
- pairs with adenine
noun
a heavy toxic silvery-white radioactive metallic element
Synonyms
Examples
- occurs in many isotopes
- used for nuclear fuels and nuclear weapons
noun
the 21st letter of the Roman alphabet
Synonyms
U
u