Definition of 'r'

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1. (noun) roentgen, R a unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air 2. (noun) gas constant, universal gas constant, R (physics) the universal constant in the gas equation: pressure times volume = R times temperature; equal to 8.3143 joules per kelvin per mole 3. (noun) R, r the 18th letter of the Roman alphabet 4. (noun) radius, r the length of a line segment between the center and circumference of a circle or sphere
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"r." Definitions.net. STANDS4 LLC, 2008. 15 October. 2008. http://www.definitions.net/definition/r