Word:

Radius vector

Ra´di`us vec´tor   Pronunciation: vĕk´tǒr
n.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.
Noun1.radius vector - a line connecting a satellite to the center of the body around which it is rotating
2.radius vector - a line connecting a point in space to the origin of a polar coordinate system
vector
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-- Radius vector --
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