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r Definition
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r
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
Synonyms: roentgen,
r
noun()(physics) the universal constant in the gas equation: pressure times volume = R times temperature; equal to 8.3143 joules per kelvin per mole
Synonyms: gas constant, universal gas constant,
r
noun()the length of a line segment between the center and circumference of a circle or sphere
Synonyms: radius,
r
noun()the 18th letter of the Roman alphabet