1. A unit of radiation exposure;
    The dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air (synset 113667510)
  2. (physics) the universal constant in the gas equation: pressure times volume = R times temperature;
    Equal to 8.3143 joules per kelvin per mole (synset 113611282)
  3. The 18th letter of the Roman alphabet (synset 106846054)
  4. The length of a line segment between the center and circumference of a circle or sphere (synset 105109363)

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