Radius of curvature
Radius Ra"di*us (r[=a]"d[i^]*[u^]s), n.; pl. L. {Radii} (r[=a]"d[i^]*[imac]); E. {Radiuses} (r[=a]"d[i^]*[u^]s*[e^]z). [L., a staff, rod, spoke of a wheel, radius, ray. See {Ray} a divergent line.] 1. (Geom.) A right line drawn or extending from the center of a circle to the periphery; the semidiameter of a circle or sphere. [1913 Webster]

2. (Anat.) The preaxial bone of the forearm, or brachium, corresponding to the tibia of the hind limb. See Illust. of {Artiodactyla}. [1913 Webster]

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. [1913 Webster]

3. (Bot.) A ray, or outer floret, of the capitulum of such plants as the sunflower and the daisy. See {Ray}, 2. [1913 Webster]

4. pl. (Zo["o]l.) (a) The barbs of a perfect feather. (b) Radiating organs, or color-markings, of the radiates. [1913 Webster]

5. The movable limb of a sextant or other angular instrument. --Knight. [1913 Webster]

{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}. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • Radius of curvature — may refer to: Radius of curvature (mathematics) Radius of curvature (optics) Radius of curvature (applications), in geodesy and materials science The reciprocal of the curvature, in differential geometry Radius, for a sphere (lingo) The radius of …   Wikipedia

  • Radius of curvature — Curvature Cur va*ture (k?r v? t?r; 135), n. [L. curvatura. See {Curvate}.] 1. The act of curving, or the state of being bent or curved; a curving or bending, normal or abnormal, as of a line or surface from a rectilinear direction; a bend; a… …   The Collaborative International Dictionary of English

  • radius of curvature — kreivumo spindulys statusas T sritis Standartizacija ir metrologija apibrėžtis Kreivės arba kreivo paviršiaus spindulys. atitikmenys: angl. radius of curvature vok. Krümmungsradius, m rus. радиус кривизны, m pranc. rayon de courbure, m …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • radius of curvature — kreivumo spindulys statusas T sritis fizika atitikmenys: angl. radius of curvature vok. Krümmungsradius, m rus. радиус кривизны, m pranc. rayon de courbure, m …   Fizikos terminų žodynas

  • radius of curvature — noun the radius of the circle of curvature; the absolute value of the reciprocal of the curvature of a curve at a given point (Freq. 3) • Hypernyms: ↑radius, ↑r …   Useful english dictionary

  • radius of curvature — Math. the absolute value of the reciprocal of the curvature at a point on a curve. Cf. circle of curvature. [1745 55] * * * …   Universalium

  • radius of curvature — noun the radius of that circle (called the osculating circle) whose arc best approximates a curve in the vicinity of a point on the curve …   Australian English dictionary

  • radius of curvature — noun The radius of the osculating circle at the point on the curve …   Wiktionary

  • radius of curvature — Date: circa 1753 the reciprocal of the curvature of a curve …   New Collegiate Dictionary

  • Radius of curvature (optics) — Radius of curvature has specific meaning and sign convention in optical design. A spherical lens or mirror surface has a center of curvature located in (x, y, z) either along or decentered from the system local optical axis. The vertex… …   Wikipedia

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