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Open English Wordnet
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Nouns
(n)
roentgen
,
R
a unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air
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(n)
gas constant
,
universal gas constant
,
R
(physics) the universal constant in the gas equation: pressure times volume = R times temperature; equal to 8.3143 joules per kelvin per mole
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(n)
R
,
r
the 18th letter of the Roman alphabet
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