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Dictionary definition for the word "r"
r
(noun)
4 definitions 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 [syn: roentgen] 2: (physics) the universal constant in the gas equation: pressure times volume = R times temperature; equal to 8.3143 joules per kelvin per mole [syn: gas constant, universal gas constant] 3: the 18th letter of the Roman alphabet 4: the length of a line segment between the center and circumference of a circle or sphere [syn: radius]
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