u

Noun
  1. A base containing nitrogen that is found in RNA (but not in DNA) and derived from pyrimidine;
    Pairs with adenine (synset 115108924)
    is a type of: base, nucleotide - a phosphoric ester of a nucleoside; the basic structural unit of nucleic acids (DNA or RNA)
    substance meronym: ribonucleic acid, rna - (biochemistry) a long linear polymer of nucleotides found in the nucleus but mainly in the cytoplasm of a cell where it is associated with microsomes; it transmits genetic information from DNA to the cytoplasm and controls certain chemical processes in the cell
    same as: uracil
  2. A heavy toxic silvery-white radioactive metallic element;
    Occurs in many isotopes;
    Used for nuclear fuels and nuclear weapons (synset 114684622)
    is a type of: metal, metallic element - any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.
    subtypes:
    • uranium 235 - a uranium isotope with mass number 235; capable of sustaining chain reactions
    • uranium 238 - the commonest isotope of uranium; it is not fissionable but when irradiated with neutrons it produces fissionable plutonium 239
    substance meronym: pitchblende, uraninite - a mineral consisting of uranium oxide and trace amounts of radium and thorium and polonium and lead and helium; uraninite in massive form is called pitchblende which is the chief uranium ore
    same as: atomic number 92, uranium
  3. The 21st letter of the Roman alphabet (synset 106846378)
    is a type of: alphabetic character, letter, letter of the alphabet - the conventional characters of the alphabet used to represent speech
    belongs to: latin alphabet, roman alphabet - the alphabet evolved by the ancient Romans which serves for writing most of the languages of western Europe
Adjective
  1. (chiefly British) of or appropriate to the upper classes especially in language use (synset 300262601)
    domain region: britain, great britain, u.k., uk, united kingdom, united kingdom of great britain and northern ireland - a monarchy in northwestern Europe occupying most of the British Isles; divided into England and Scotland and Wales and Northern Ireland; `Great Britain' is often used loosely to refer to the United Kingdom
    similar to: upper-class - occupying the highest socioeconomic position in a society

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