Dictionary Results for r
1. r - noun · a unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air Synonym(s): roentgen, R Hypernym(s): radioactivity_unit
2. r - noun · (physics) the universal constant in the gas equation: pressure times volume = R times temperature; equal to 8.3143 joules per kelvin per mole Synonym(s): gas_constant, universal_gas_constant, R Hypernym(s): constant
3. r - noun · the 18th letter of the Roman alphabet Synonym(s): R Hypernym(s): letter, letter_of_the_alphabet, alphabetic_character
4. r - noun · the length of a line segment between the center and circumference of a circle or sphere Synonym(s): radius Hypernym(s): length
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