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