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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



... am not the keeper of my brother's conscience—Indeed, if I were, you might congratulate me in the words of Sir B. R. upon the possession of a ...
— Tales and Novels, Vol. VII - Patronage • Maria Edgeworth

... on British and Foreign Characteristics, published a few years ago, Mr. W. R. Greg quotes the famous letter of the Turkish cadi to Mr. Layard, with the comment that "it contains the germ and element of a wisdom to which our busy and bustling existence is a stranger"; and he uses it as a text for an instructive sermon on the "gospel of leisure." He urges, ...
— The Unseen World and Other Essays • John Fiske

... Fruits, Cotton, Tobacco, Sugar-Cane, Rice, and every staple product of the United States; with the best methods of Planting, Cultivating, and Preparation for Market. Illustrated by more than 100 engravings. By R. L. Allen. Cloth, $1; mail ...
— Rural Architecture - Being a Complete Description of Farm Houses, Cottages, and Out Buildings • Lewis Falley Allen

... Circumstances unite to establish the Fact; and that several British Words were used by the Mexicans when their Country was discovered by the Spaniards; such as Pengwyn, "White Head," the name, not only of a Bird, but also given to high and bare Rocks.[r] Groeso "Wellcome." Gwenddwr, "white or limpid Water." Bara, "Bread." Tad, "Father." Mam "Mother." Buch or Buwch, "a Cow." Clug-Jar, "a Partridge, or Heath Cock" (Clugar is now the Armorican name of a Partridge.) Llwynog, "a Fox," ...
— An Enquiry into the Truth of the Tradition, Concerning the - Discovery of America, by Prince Madog ab Owen Gwynedd, about the Year, 1170 • John Williams

... love, but unluckily much less of the same gift, occurs in the poems of a friend of Browne's once hardly known except by some fair verses on Shakespere ("Renowned Spenser," etc.), but made fully accessible by Mr. R. Warwick Bond in 1893. This was William Basse, a retainer of the Wenman family near Thame, the author, probably or certainly, of a quaint defence of retainership, Sword and Buckler (1602), and ...
— A History of English Literature - Elizabethan Literature • George Saintsbury


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