Definition of u
English to English noun - a base containing nitrogen that is found in RNA (but not in DNA) and derived from pyrimidine; pairs with adenine
source: WordNet 3.0 - a heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons
source: WordNet 3.0 - the 21st letter of the Roman alphabet
source: WordNet 3.0 adjective satellite - (chiefly British) of or appropriate to the upper classes especially in language use
source: WordNet 3.0
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