r

(n) a unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air roentgen,
(n) (physics) the universal constant in the gas equation: pressure times volume = R times temperature; equal to 8.3143 joules per kelvin per mole gas constant, universal gas constant,
(n) the 18th letter of the Roman alphabet
(n) the 18th letter of the Roman alphabet
(n) the length of a line segment between the center and circumference of a circle or sphere radius,

roentgen gas constant universal gas constant radius

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