radius vector — English Dictionary

Noun

1. Of a point, a vector going from the origin to that point; equivalently, the transpose of the point.

   Synonyms

   position vector

2. 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.

Noun

1. a line connecting a satellite to the center of the body around which it is rotating

   Broader terms

   vector

2. a line connecting a point in space to the origin of a polar coordinate system

   Broader terms

   vector