Definition of

U

  1. (noun, communication) the 21st letter of the Roman alphabet
  2. (noun, substance) a heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons
  3. (noun, substance) a base containing nitrogen that is found in RNA (but not in DNA) and derived from pyrimidine; pairs with adenine
  4. (adj, all) (chiefly British) of or appropriate to the upper classes especially in language use

via WordNet, Princeton University

Origin of the word U

  1. for historical evolution, see V. Used punningly for you by 1588 ["Love's Labour's Lost," V.i.60], not long after the pronunciation shift that made the vowel a homonym of the pronoun. As a simple shorthand (without intentional word-play), it is recorded from 1862. Common in business abbreviations since 1923 (e.g. U-Haul, attested from 1951). more

via Online Etymology Dictionary, ©2001 Douglas Harper

Words that sound like U

u308, uuh

via soundex() Hash Matches

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