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R

Definitions of R
  1. noun
    the 18th letter of the Roman alphabet
    synonyms: r
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    type of:
    alphabetic character, letter, letter of the alphabet
    the conventional characters of the alphabet used to represent speech
  2. noun
    (physics) the universal constant in the gas equation: pressure times volume = R times temperature; equal to 8.3143 joules per kelvin per mole
    synonyms: gas constant, universal gas constant
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    type of:
    constant
    a number representing a quantity assumed to have a fixed value in a specified mathematical context
  3. noun
    a unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air
    synonyms: roentgen
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    type of:
    radioactivity unit
    a measure of radioactivity
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