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 (synset 113667510)hypernym: radioactivity unit  a measure of radioactivitysynonym: roentgen 
(physics) the universal constant in the gas equation: pressure times volume = R times temperature;
Equal to 8.3143 joules per kelvin per mole (synset 113611282)domain category: natural philosophy, physics  the science of matter and energy and their interactionshypernym: constant  a number representing a quantity assumed to have a fixed value in a specified mathematical contextsynonym: gas constant, universal gas constant 
The 18th letter of the Roman alphabet (synset 106846054)
hypernym: alphabetic character, letter, letter of the alphabet  the conventional characters of the alphabet used to represent speechmember meronym: latin alphabet, roman alphabet  the alphabet evolved by the ancient Romans which serves for writing most of the languages of western Europe

The length of a line segment between the center and circumference of a circle or sphere (synset 105109363)
hypernym: length  the linear extent in space from one end to the other; the longest dimension of something that is fixed in placehyponym:
 semidiameter  the apparent radius of a celestial body when viewed as a disc from the earth
 radius of curvature  the radius of the circle of curvature; the absolute value of the reciprocal of the curvature of a curve at a given point
part meronym: diam, diameter  the length of a straight line passing through the center of a circle and connecting two points on the circumferencesynonym: radius
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