NOUN | quantity | R, roentgen | a unit of radiation exposure |
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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 | |
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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. | |
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Synonym | roentgen | |

Broader | radioactivity unit | A measure of radioactivity |

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. | |
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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 |

Meaning | The 18th letter of the Roman alphabet. | |
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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 |

Catalan | r | |

Spanish | R |

Meaning | The length of a line segment between the center and circumference of a circle or sphere. | |
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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 |

Catalan | radi | |

Spanish | radio |