radius vector

noun

Definition of radius vector 

1a : the line segment or its length from a fixed point to a variable point

b : the linear polar coordinate of a variable point

2 : a straight line joining the center of an attracting body (such as the sun) with that of a body (such as a planet) in orbit around it

First Known Use of radius vector

1740, in the meaning defined at sense 2

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The first known use of radius vector was in 1740

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