Definition - r

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r
  1. the length of a line segment between the center and circumference of a circle or sphere
  2. the 18th letter of the Roman alphabet
  3. (physics) the universal constant in the gas equation: pressure times volume = R times temperature; equal to 8.3143 joules per kelvin per mole
  4. a unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air
  5. WICKED
  6. wipe out
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