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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Cite this Entry

“Radius vector.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/radius%20vector. Accessed 21 Jan. 2021.

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