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r

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r [n]
 
1)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 
    See Also: radioactivity_unit 
 
2)(physics) the universal constant in the gas equation: pressure times volume = R times temperature; equal to 8.3143 joules per kelvin per mole
    Synonyms :gas_constant universal_gas_constant 
    See Also: constant  natural_philosophy 
 
3)the 18th letter of the Roman alphabet
    Synonyms :
    See Also: alphabetic_character  latin_alphabet 
 
4)the length of a line segment between the center and circumference of a circle or sphere
    Synonyms :radius 
    See Also: length  diam  semidiameter  radius_of_curvature 
 



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