- (n.) 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.
- 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.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). radius vector. Retrieved September 20, 2026, from http://smartdefine.org/radius_vector/definitions/2052330 |
| Chicago | Webster's. 2011. "radius vector" http://smartdefine.org/radius_vector/definitions/2052330 (accessed September 20, 2026). |
| Harvard | Webster's 2011, radius vector, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/radius_vector/definitions/2052330>. |
| MLA | Webster's. "radius vector" 27 May 2011. Web. 20 September 2026. <http://smartdefine.org/radius_vector/definitions/2052330> |