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Definitions of r
  1. 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

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  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
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  3. noun
    the length of a line segment between the center and circumference of a circle or sphere

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  4. noun
    the 18th letter of the Roman alphabet
Antonyms of r
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