| NOUN | quantity | R, roentgen | a unit of radiation exposure |
|---|---|---|---|
| quantity | R, gas constant, universal gas constant | (physics) the universal constant in the gas equation | |
| communication | R / r | the 18th letter of the Roman alphabet | |
| attribute | r, radius | the length of a line segment between the center and circumference of a circle or sphere |
| Sounds | aa'r | |
|---|---|---|
| Rhymes | Adar ... Zanzibar: 81 rhymes with 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. | |
|---|---|---|
| Synonym | roentgen | |
| Broader | radioactivity unit | A measure of radioactivity |
| Spanish | roentgen | |
| Catalan | roentgen | |
| Meaning | (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 | |
| Category | physics, natural philosophy | The science of matter and energy and their interactions |
| Broader | constant | A number representing a quantity assumed to have a fixed value in a specified mathematical context |
| Catalan | constant dels gasos | |
| Meaning | The 18th letter of the Roman alphabet. | |
|---|---|---|
| Member of | Roman alphabet, Latin alphabet | The alphabet evolved by the ancient Romans which serves for writing most of the languages of western Europe |
| Broader | letter, letter of the alphabet, alphabetic character | The conventional characters of the alphabet used to represent speech |
| Spanish | R | |
| Catalan | r | |
| Meaning | The length of a line segment between the center and circumference of a circle or sphere. | |
|---|---|---|
| Synonym | radius | |
| Part of | diameter, diam | The length of a straight line passing through the center of a circle and connecting two points on the circumference |
| Narrower | radius of curvature | The radius of the circle of curvature |
| semidiameter | The apparent radius of a celestial body when viewed as a disc from the earth | |
| Broader | length | The linear extent in space from one end to the other |
| Spanish | radio, r | |
| Catalan | radi, r | |
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