Rā'di-ŭs-vĕc'tor, n.
n. [Lat. radius, a radius, and vector, a bearer, from vehere, to bear, carry.]
Sense 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 it turns, and to which it serves to refer the successive points of a curve, in a system of polar co-ordinates.
Sense 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.