DICT.TW Dictionary Taiwan

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