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RADIUS

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Originally appearing in Volume V22, Page 808 of the 1911 Encyclopedia Britannica.

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RADIUS , properly a straight See also:

rod, See also:

bar or See also:

STAFF (O. Eng. staef, cf. Du. staf, Ger. Stab, &c.; Icel. stafr meant also a written letter, and O. Eng. stafas, the letters of the alphabet; " stave," one of the thin pieces of wood of which a cask is made, is a doublet)

staff, the See also:

ORIGINAL

original meaning of the Latin word, to which also many of the various meanings seen in See also:

ENGLISH

English were attached; it was thus applied to the spokes of a See also:

wheel, to the semi-See also:

DIAMETER (from the Cr. &a, through, µErpov, measure)

diameter of a circle or See also:

SPHERE (Gr. vclsa?pa, a ball or globe)

sphere and to a See also:

ray or See also:

beam of See also:

LIGHT

light, " ray " itself coming through the Fr. raie from radius. From this last sense comes" radiant," " See also:

RADIATION, THEORY OF

radiation," and allied words. In See also:

MATHEMATICS (Gr. /saBnµar1Kil, Sc. vOcvn or E7rlQTt'µn; from p iN.La, "learning" or "science ")

mathematics, a radius is a straight See also:

LINE

line See also:

DRAWN

drawn from the centre to the circumference of a circle or to the See also:

SURFACE

surface of a sphere; in See also:

anatomy the name is applied to the See also:

OUTER

outer one of the two bones of the fore-See also:

ARM (a common Teutonic word; the Indo-European root is ar, to join or fit; cf. the Lat. armus, shoulder, and the plural word arma, weapons, Gr. apphs, joint, and the reduplicated apapilKSV, to join)

arm in See also:

man or to the corresponding See also:

bone in the fore-See also:

leg of animals. It is also used in various other anatomical senses in See also:

BOTANY (from Gr. l3or6v17, plant; ,66vicety, to graze)

botany, See also:

ICHTHYOLOGY (from Gr. LxObs, fish, and Xoyos, doctrine or treatise)

ichthyology, See also:

ENTOMOLOGY (Gr. iv-roµa, insects, and Xiryos, a discourse)

entomology, &c. A further application of the See also:

TERM

term is to an See also:

AREA

area the extent of which is marked by the length of the radius from the point which is taken as the centre; thus, in See also:

LONDON

London, for the purpose of reckoning the fare of See also:

hackney-carriages, the radius is taken as extending four See also:

MILES, NELSON APPLETON (1839— )

miles in any direction from Charing. See also:

CROSS

End of Article: RADIUS

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RADIUM (from Lat. radius, ray)

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RADNOR, EARLS OF