R

مترادف و متضاد r

1. noun The length of a line segment between the center and circumference of a circle or sphere
   Synonyms: radius, röntgen
2. noun The 18th letter of the Roman alphabet
   Synonyms: r
3. 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