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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



... appearing in the visible spectrum—are absorbed and employed by these and other colourless bacteria. The purple bacteria have thus two sources of energy, one by the oxidation of sulphur and another by the absorption of "dark rays." Stoney (Scient. Proc. R. Dub. Soc., 1893, p. 154) has suggested yet another source of energy, in the bombardment of these minute masses by the molecules of the environment, the velocity of which is sufficient to drive them well into the organism, and carry energy in ...
— Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 2 - "Baconthorpe" to "Bankruptcy" • Various

... and the contumely of the ill-tempered and crack-brained adventurer. An impartial critic must admit, indeed, that he was something of both, though more of the hero than the adventurer, and that his biographers have erred considerably in what Mr. R. L. Stevenson would call their "point ...
— Christopher Columbus and His Monument Columbia • Various

... be taken—as assuredly they were composed—in mere sport.' These lines, which were directed against Sir James Mackintosh, were included in a letter to [Sir] Humphry Davy, dated October 9, 1800. There is a MS. version in the British Museum in the handwriting of R. Heber, presented by him to J. Mitford. Mr. Campbell questions the accuracy of Coleridge's statement with regard to his never having published the poem on his own account. But it is possible that Davy may have sent the lines to the Press without ...
— The Complete Poetical Works of Samuel Taylor Coleridge - Vol I and II • Samuel Taylor Coleridge

... buyers. Therefore they have demonstrated for me that a stupid book doesn't pay; and I will not, even for my best friend, write anything but what the people will buy from me. I am not a Fellow of the R.S.C., and if I produced anything dreary I could not look for the solace of having that discerning association clap their hands ...
— The Four Canadian Highwaymen • Joseph Edmund Collins

... of the church and monuments, as seen at the present day, were taken by Mr. Edgar Scamell, of 120, Crouch Hill; and the seal-impressions by Mr. A. P. Ready, the British Museum artist. Finally, Sir Aston Webb, R.A., has to be thanked for the ground-plans of the church and monastic buildings; and Mr. G. H. Smith for the plan and dimensions ...
— Bell's Cathedrals: The Priory Church of St. Bartholomew-the-Great, Smithfield • George Worley


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