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1. (n.) radius vector
Math. the length of the line segment joining a fixed point or origin to a given point.
2. radius vector
Astron.
3. radius vector
the straight line joining two bodies in relative orbital motion, as the line from the sun to a planet at any point in its orbit.
4. radius vector
the distance between two such bodies at any point in the orbit.
Etymology: (1745–55)
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| Definition of 'radius vector' |
Princeton's WordNet |
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1. (noun) radius vector
a line connecting a satellite to the center of the body around which it is rotating
2. (noun) radius vector
a line connecting a point in space to the origin of a polar coordinate system
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| Definition of 'radius vector' |
Webster Dictionary |
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1. (noun) radius vector
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
2. radius vector
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
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Definitions of radius vector 
