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R 1

Definition: R, the eighteenth letter of the English alphabet, is a vocal consonant. It is sometimes called a semivowel, and a liquid. See Guide to Pronunciation, and

r 2

Definition: the length of a line segment between the center and circumference of a circle or sphere

R 3

Definition: the 18th letter of the Roman alphabet

R 4

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

R 5

Definition: a unit of radiation exposure; the dose of ionizing radiation that will produce electrostatic unit of electricity in cc of dry air


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