Pronunciation :'är. Function :noun. Date :before 12th century.
| R | A trademark used for a movie rating indicating that admission will be granted only to persons of or over a certain age, usually 17, unless accompanied by a parent or guardian | en | |||
| r | (physics) the universal constant in the gas equation: pressure times volume = R times temperature; equal to 8 3143 joules per kelvin per mole | en | |||
| r | the 18th letter of the Roman alphabet | en | |||
| r | the length of a line segment between the center and circumference of a circle or sphere | en | |||
| r | a unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air | en | |||
| r | See Guide to Pronunciation, §§ 178, 179, and 250-254 | en | |||
| r | R, the eighteenth letter of the English alphabet, is a vocal consonant | en | |||
| r | 18th letter of the English alphabet isim | en | |||
| r | It is sometimes called a semivowel, and a liquid | en | |||
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