r is the dictionary form of r's Definition of r
r has definitions from the fields of geometry,physics,mathematics,thermodynamics
1
[ noun ] (physics) a unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air

Synonyms

roentgen

2
[ noun ] the 18th letter of the Roman alphabet
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
4
[ noun ] (geometry) the length of a line segment between the center and circumference of a circle or sphere

Synonyms

radius

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