phonetic symbol: / ár / 

r - English Dictionary

[ noun ]
■ the length of a line segment between the center and circumference of a circle or sphere

[ noun ]
■ the 18th letter of the Roman alphabet

[ noun ]
■ (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

[ 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

Word list en

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