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u
 
Adjective u has 1 sense
  1. u - (chiefly British) of or appropriate to the upper classes especially in language use
    Antonyms:     lower-class, low-class (indirect, via middle-class, upper-class)
    Antonym: middle-class (indirect, via upper-class, lower-class)
Noun u has 3 senses
  1. uracil, U - a nitrogen-containing base found in RNA (but not in DNA) and derived from pyrimidine; pairs with adenine
    --1 is a kind of nucleotide
    --1 is a substance of ribonucleic acid, RNA
  2. uranium, U, atomic number 92 - a heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons
    --2 is a kind of metallic element, metal
    --2 is a substance of uraninite, pitchblende
    --2 has particulars: uranium 235; uranium 238
  3. U - the 21st letter of the Roman alphabet
    --3 is a kind of     letter, letter of the alphabet, alphabetic character
    --3 is a member of Roman alphabet, Latin alphabet
u.s. congress u.s. government u.s. house u.s. house of representatives u.s. mint u.s. national library of medicine u.s. waters u.s.a. u u attitude u nitrogen base u suck u tube u308 uacute uae uakari

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