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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



... piece of cast iron which Mr. Mushet states he ever saw, exhibited the arms of England, with the initials E. R., and bore date 1555 (?), but he found no specimen in the Forest earlier than 1620. A few cast-iron fire-backs have been noticed in some of the old houses in the vicinity of the Forest, but none have an earlier date on them. The cast-iron grave-slabs found in the ancient iron-making ...
— Iron Making in the Olden Times - as instanced in the Ancient Mines, Forges, and Furnaces of The Forest of Dean • H. G. Nicholls

... page is mainly a series of quotations from Dr. R.D. Hitchcock's sermon on "Religion, the ...
— The Whence and the Whither of Man • John Mason Tyler

... the royal box, and the prince caused it to be intimated to Mary Anderson that he should be glad to be introduced to her after the third act. The little republican naively responded that she never saw any one till after the close of the performance. H.R.H. promptly rejoined that he always left the theater immediately the curtain fell. Meanwhile the manager represented to her the ungraciousness of not complying with a request which half the actresses ...
— Mary Anderson • J. M. Farrar

... his friends. It gives me a melancholy pleasure to render this tribute to his memory. For steady friendship and most valuable aid our best thanks are also due to Captain, now Lieut.-Colonel, Birney, R.E., the resident Chief Engineer; Robert Troup, Esq., a tea-planter in the neighbourhood; and Mr. Ashhurst, engineer. Among the friends not resident at Ranee Khet, to whom the Mission is largely indebted, are Sir Henry Ramsay and Sir William Muir. Besides the friends I ...
— Life and Work in Benares and Kumaon, 1839-1877 • James Kennedy

... annos quinquaginta solverent. Ibid. 3. Et naves rostratas, praeter decem triremes, traderent, elephantosque, quos haberent domitos; neque domarent alios; Bellum neve in Africa, neve extra Africam, injussu P. R. gererent, &c. Ibid.] ...
— An Essay on the Slavery and Commerce of the Human Species, Particularly the African • Thomas Clarkson


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