r
English Thesaurus
1. the length of a line segment between the center and circumference of a circle or sphere (noun.attribute)
| hypernym | : | length, |
| definition | : | the linear extent in space from one end to the other; the longest dimension of something that is fixed in place (noun.attribute) |
| hyponym | : | semidiameter, |
| definition | : | the apparent radius of a celestial body when viewed as a disc from the earth (noun.attribute) |
| hyponym | : | radius of curvature, |
| definition | : | the radius of the circle of curvature; the absolute value of the reciprocal of the curvature of a curve at a given point (noun.attribute) |
| part meronym | : | diam, diameter, |
| definition | : | the length of a straight line passing through the center of a circle and connecting two points on the circumference (noun.attribute) |
2. the 18th letter of the Roman alphabet (noun.communication)
| member meronym | : | latin alphabet, roman alphabet, |
| definition | : | the alphabet evolved by the ancient Romans which serves for writing most of the languages of western Europe (noun.communication) |
3. (physics) the universal constant in the gas equation: pressure times volume = R times temperature; equal to 8.3143 joules per kelvin per mole (noun.quantity)
| hypernym | : | constant, |
| definition | : | a number representing a quantity assumed to have a fixed value in a specified mathematical context (noun.quantity) |
| domain category | : | natural philosophy, physics, |
| definition | : | the science of matter and energy and their interactions (noun.cognition) |
4. a unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air (noun.quantity)
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