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- the 18th letter of the Roman alphabet
- the length of a line segment between the center and circumference of a circle or sphere
- (physics) the universal constant in the gas equation: pressure times volume = R times temperature; equal to 8.3143 joules per kelvin per mole
- 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 is a noun.

14-Apr 17-Mar 19-Mar 25-Mar 2-Mar aar aare river aaron burr abacus major abandoner

latin alphabet alphabetic character radius of curvature length constant radioactivity unit