radius : Idioms & Phrases

Index

Geometrical radius

  • in gearing, the radius of the pitch circle of a cogwheel. Knight.
Webster 1913

Radius bar

  • (Math.), 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.
Webster 1913

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
WordNet
  • . See under Curvature.
Webster 1913

radius vector

  • noun a line connecting a satellite to the center of the body around which it is rotating
  • noun a line connecting a point in space to the origin of a polar coordinate system
WordNet
Ra"di*us vec"tor
Definitions
  1. (Math.) A straight line (or the length of such line) connecting any point, as of a curve, with a fixed point, or pole, round which the straight line turns, and to which it serves to refer the successive points of a curve, in a system of polar coördinates. See Coördinate, n.
  2. (Astron.) An ideal straight line joining the center of an attracting body with that of a body describing an orbit around it, as a line joining the sun and a planet or comet, or a planet and its satellite.
Webster 1913