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2 definitions found
 for Radius vector
From The Collaborative International Dictionary of English v.0.48 :

  Radius vector \Ra"di*us vec"tor\ (v[e^]k"t[o^]r).
     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 coordinates. See Coordinate, n.
        [1913 Webster]
     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.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

  radius vector
      n 1: a line connecting a satellite to the center of the body
           around which it is rotating
      2: a line connecting a point in space to the origin of a polar
         coordinate system

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