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English - English Dict (Wordnet)
r
Noun
the length of a line segment between the center and circumference of a circle or sphere
the 18th letter of the Roman alphabet
(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
Related words
Synonyms:
radius
R
gas constant
universal gas constant
roentgen
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r
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