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Definition of R

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noun (n)

  • a unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air (noun.quantity)
    Synonym: roentgen
    source: wordnet30
  • (physics) the universal constant in the gas equation: pressure times volume = R times temperature; equal to 8.3143 joules per kelvin per mole (noun.quantity)
    source: wordnet30
  • the 18th letter of the Roman alphabet (noun.communication)
    source: wordnet30
  • the length of a line segment between the center and circumference of a circle or sphere (noun.attribute)
    Synonym: radius
    source: wordnet30

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