r

This word does not have a syllable breakdown in our dictionary yet, so pronunciation and parts are not shown.

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.

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

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.