r

Noun
  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 (synset 113667510)
    is a type of: radioactivity unit - a measure of radioactivity
    same as: roentgen
  2. (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)
    referred to in: natural philosophy, physics - the science of matter and energy and their interactions
    is a type of: constant - a number representing a quantity assumed to have a fixed value in a specified mathematical context
    same as: gas constant, universal gas constant
  3. The 18th letter of the Roman alphabet (synset 106846054)
    is a type of: alphabetic character, letter, letter of the alphabet - the conventional characters of the alphabet used to represent speech
    belongs to: latin alphabet, roman alphabet - the alphabet evolved by the ancient Romans which serves for writing most of the languages of western Europe
  4. The length of a line segment between the center and circumference of a circle or sphere (synset 105109363)
    is a type of: length - the linear extent in space from one end to the other; the longest dimension of something that is fixed in place
    subtypes:
    • 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
    is a part of: diam, diameter - the length of a straight line passing through the center of a circle and connecting two points on the circumference
    same as: radius

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