| 单词 | radius vector |
| 释义 | radius vector pl. radii vectores /vek tawr"eez, -tohr"-/, radius vectors. 1. Math. the length of the line segment joining a fixed point or origin to a given point. 2. Astron. a. 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. b. the distance between two such bodies at any point in the orbit. [1745-55] |
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