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Radius   /rˈeɪdiəs/   Listen
Radius

noun
(pl. L. radii; E. radiuses)
1.
The length of a line segment between the center and circumference of a circle or sphere.  Synonym: r.
2.
A straight line from the center to the perimeter of a circle (or from the center to the surface of a sphere).
3.
A circular region whose area is indicated by the length of its radius.
4.
The outer and slightly shorter of the two bones of the human forearm.
5.
Support consisting of a radial member of a wheel joining the hub to the rim.  Synonyms: spoke, wheel spoke.



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"Radius" Quotes from Famous Books



... I have measured the areas of circles of 1 inch, 2 inches, and 3 inches radius, the guide being taken round the circumference by means of a "control lineal," first with an ordinary Amsler's planimeter and then with the integraph. I have obtained the ...
— Scientific American Supplement, No. 794, March 21, 1891 • Various

... Webb acquired a distinction perhaps unparalleled to the present time. This has made his name familiar all over Christendom, and honored among the world's benefactors. Never, before him, did a farm-stead become such a centre and have such a wide-sweeping radius as his. None ever possessed such centripetal attractions, or exerted such centrifugal influences for the material well-being of different and distant countries. Indeed, those most remote are most specially indebted to his large and generous operations. America and Australia ...
— A Walk from London to John O'Groat's • Elihu Burritt

... worldliness brought a revelation that they must seek greater seclusion. A large tract on the Iowa River was purchased, and to this new site the population was gradually transferred. There they built Amana. Within a radius of six miles, five subsidiary villages sprang up, each one laid out like a German dorf, with its cluster of shops and mills, and the cottages scattered informally on the main road. When the railway tapped ...
— Our Foreigners - A Chronicle of Americans in the Making • Samuel P. Orth

... the sun rotated in the same time as the earth, and their diameters were equal, the centrifugal force on the equators of the two orbs would be equal. But the sun's radius is about 111 times that of the earth, and if the period of rotation were the same, the centrifugal force at the sun's equator would be greater than that at the earth's in the ratio of (111)^2 to 1, or, more exactly, in the ratio of 12,342.27 to 1. But ...
— Atlantic Monthly Vol. 6, No. 33, July, 1860 • Various

... in the first place to the fore-limb. In most quadrupeds, as in ourselves, the fore-arm contains distinct bones, called the radius and the ulna. The corresponding region in the horse seems at first to possess but one bone. Careful observation, however, enables us to distinguish in this bone a part which clearly answers to the upper end of the ulna. This is closely united with the chief mass of the bone ...
— Darwinism (1889) • Alfred Russel Wallace


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