R — synonyms, definition

1. R (Noun)

Radius Roentgen gas constant rontgen universal gas constant

R (Noun) — The 18th letter of the Roman alphabet.

R (Noun) — The length of a line segment between the centre and circumference of a circle or sphere.

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.

R (Noun) — (physics) the universal constant in the gas equation: pressure times volume = R times temperature; equal to 8.3143 joules per kelvin per mole.

alphabetic character constant length letter letter of the alphabet radioactivity unit radius of curvature semidiameter Latin alphabet Roman alphabet diam diameter