r
| 1. |
(noun) the length of a line segment between the center and circumference of a circle or sphere |
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Synonyms: radius |
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Related Words: length, radius of curvature, semidiameter |
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| 2. |
(noun) 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 |
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Related Words: radioactivity unit |
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