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/rˈeɪdiəs/ Listen

noun

Radius n. (pl. L. radii; E. radiuses)

(Geom.) A right line drawn or extending from the center of a circle to the periphery; the semidiameter of a circle or sphere.

(Anat.) The preaxial bone of the forearm, or brachium, corresponding to the tibia of the hind limb. Note: The radius is on the same side of the limb as the thumb, or pollex, and in man it is so articulated that its lower end is capable of partial rotation about the ulna.

(Bot.) A ray, or outer floret, of the capitulum of such plants as the sunflower and the daisy. See Ray, 2.

pl. (Zool.)

(a)

The barbs of a perfect feather.

(b)

Radiating organs, or color-markings, of the radiates.

The movable limb of a sextant or other angular instrument.

Radius bar (Mach.), a bar pivoted at one end, about which it swings, and having its other end attached to a piece which it causes to move in a circular arc.

Radius of curvature. See under Curvature.

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Etymology of 'Radius'

Collaborative International Dictionary of English 0.48

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"Radius" Quotes from Famous Books

... no signals were given. The little craft was to be at a certain place at a certain hour,—and she was there! The men who jumped knew that she would be there. A black, tiny speck on the broad expanse of water, sheltered by a night of almost stygian darkness, she lay outside the narrow radius to which visual observation was confined, patiently waiting for the Doraine to pass a designated point. There was to be no miscalculation on the part of either the boat or the men who went over the side of the big steamship into the ...

— West Wind Drift • George Barr McCutcheon

... frequently to do daily work, the home is locked up till evening, and she often leaves before the children start for morning school. It is a curious but very common fact that, free though these children are, they know only a very small radius around their own homes. They are accustomed to be sent shopping into High Street, where household stores are bought in pennyworths or twopennyworths, owing to uncertain finance and no storage accommodation. Generally there is one tap and one sink in the basement for the needs of all the families ...

— The Child Under Eight • E.R. Murray and Henrietta Brown Smith

... Knapp made his fortune. A gentleman asked him to procure him some old-fashioned articles of this sort, and the peddler at once went into the matter on speculation, and bought up all the old brasses he could find within a radius of fifty miles. These fenders and andirons were gladly parted with, growing rusty as they had been for years, and almost forgotten in garrets and cellars. New England farmers remember too distinctly the shiverings and burnings of their youth not to feel an insurmountable ...

— Lippincott's Magazine, Vol. 22, November, 1878 - of Popular Literature and Science • Various

... wondering whether it would be possible to use wireless telephony in Alaska. But I'm such a dub at electricity. Do you know—— What would be the cost of installing a wireless telephone plant with a hundred-mile radius?" ...

— Free Air • Sinclair Lewis

... Ireland, which was the lighting of fires in honour of the sun. Accordingly, exactly at midnight, the fires began to appear; and taking the advantage of going up to the leads of the house, which had a widely extended view, I saw on a radius of thirty miles, all around, the fires burning on every eminence which the country afforded. I had a farther satisfaction in learning, from undoubted authority, that the people danced round the fires, and at the close went through these fires, and made their sons and daughters, together with ...

— Balder The Beautiful, Vol. I. • Sir James George Frazer

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