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R   /ɑr/   Listen
R

noun
1.
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.
2.
(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.
3.
The 18th letter of the Roman alphabet.
4.
The length of a line segment between the center and circumference of a circle or sphere.  Synonym: radius.



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"R" Quotes from Famous Books



... princes and estates nevertheless passed no resolution requiring its subscription. Melanchthon writes that the princes had expressly declared that they would abide by the Wittenberg Concord. (C. R. 3, 292.) Veit Dietrich's remark to Foerster, May 16, 1537, that only the Augustana and the Concord were signed at Smalcald, is probably due to a mistake ...
— Historical Introductions to the Symbolical Books of the Evangelical Lutheran Church • Friedrich Bente

... people in such a way that at the close of the preaching the seekers fairly ran to the front benches, taking them by storm. All around the front they sat or knelt. We placed chairs in rows on the platform, and the crowd was so thick I could scarcely get a place to stand. The pastor, Rev. R.C. Bedford, and the Christians, worked hard among the unconverted, and now at the close of the three weeks' services, more than two hundred are rejoicing in ...
— American Missionary, Volume 43, No. 5, May, 1889 • Various

... me by the Rev. R. T. Lowe from off the Testudo caretta, taken near Madeira, the scuta have their lateral lobes broad and nearly rectangular: the carina extends nearly to between the terga: the terga are nearly straight, somewhat pointed ...
— A Monograph on the Sub-class Cirripedia (Volume 1 of 2) - The Lepadidae; or, Pedunculated Cirripedes • Charles Darwin

... the legend of the Weaving-Maiden seems to have been well known in Japan; for it is recorded that on the seventh night of the seventh year of Y[o]r[o] (A.D. 723) the poet Yamagami no Okura composed ...
— The Romance of the Milky Way - And Other Studies & Stories • Lafcadio Hearn

... Lee, Robert Smalls. 1st District—John M. Freeman. 2nd District—Paris Simpkins, Seymour E. Smith. 4th District—Charles M. Wilder, Wilson Cooke. 5th District—Eugene H. Dibble. 6th District—Edmund H. Deas. 7th District—Wm. H. Thompson. Samuel Lee on Committee to notify nominees. Major John R. Lynch, delegate from Mississippi, was elected temporary chairman, the first and only time that a colored man ever presided ...
— The Journal of Negro History, Volume 7, 1922 • Various


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