HyperDic is a hyper-dictionary based on WordNet 2.1. This version links 147,249 word forms.
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| NOUN | 1 | R, roentgen | A unit of radiation exposure |
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| 2 | R, gas constant, universal gas constant | (physics) the universal constant in the gas equation: pressure times volume = R times temperature | |
| 3 | R, letter r | The 18th letter of the Roman alphabet | |
| 4 | r, radius | The length of a line segment between the center and circumference of a circle or sphere |
| Sounds | aa'r |
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| Rhymes | Adar, afar, ajar, and 72 more rhymes in aar... |
| Meaning | A unit of radiation exposure. The dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air. |
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| Synonyms | roentgen |
| Broader | radioactivity unit |
| Meaning | (physics) the universal constant in the gas equation: pressure times volume = R times temperature. Equal to 8.3143 joules per kelvin per mole. |
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| Synonyms | gas constant, universal gas constant |
| Category | physics, physical science, natural philosophy |
| Broader | constant |
| Meaning | The 18th letter of the Roman alphabet. |
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| Synonyms | letter r |
| Member of | Roman alphabet, Latin alphabet |
| Broader | letter, letter of the alphabet, alphabetic character |
| Meaning | The length of a line segment between the center and circumference of a circle or sphere. |
|---|---|
| Synonyms | radius |
| Part of | diameter, diam |
| Broader | length |
| Narrower | semidiameter; radius of curvature |
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