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 | ||
| Synonyms | roentgen | ||
| 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 | ||
| Synonyms | gas constant, universal gas constant | ||
| Broader (hypernym) | constant | ||
| Domain category | natural philosophy, physics | ||
| 3. | R (communication) the 18th letter of the Roman alphabet | ||
| Broader (hypernym) | alphabetic character, letter, letter of the alphabet | ||
| Member meronym | Latin alphabet, Roman alphabet | ||
| 4. | r (attribute) the length of a line segment between the center and circumference of a circle or sphere | ||
| Synonyms | radius | ||
| Broader (hypernym) | length | ||
| Narrower (hyponym) | radius of curvature, semidiameter | ||
| Part meronym | diam, diameter | ||
Based on WordNet 3.0 copyright © Princeton University.
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Web design: Orcapia v/Per Bang. English edition: .
2025 onlineordbog.dk