English dictionary



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English noun: R

1. R (quantity) a unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air


Synonymsroentgen


Broader (hypernym)radioactivity unit

2. R (quantity) (physics) the universal constant in the gas equation: pressure times volume = R times temperature; equal to 8.3143 joules per kelvin per mole


Synonymsgas constant, universal gas constant


Broader (hypernym)constant


Domain categorynatural philosophy, physics

3. R (communication) the 18th letter of the Roman alphabet


Broader (hypernym)alphabetic character, letter, letter of the alphabet


Member meronymLatin alphabet, Roman alphabet

4. r (attribute) the length of a line segment between the center and circumference of a circle or sphere


Synonymsradius


Broader (hypernym)length


Narrower (hyponym)radius of curvature, semidiameter


Part meronymdiam, diameter









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