| 单词 | versor |
| 释义 | ▪ I. † versor1 Obs.
In 5 versour(e.
[a. AF. *versour (F. verseur), f. verser to pour, verse v.2]
(See quots.)
a1483Liber Niger in Househ. Ord. (1790) 77 One chief sobyr yeoman versoure, to resceyve all the ale or beere that shall be pourveyede. Ibid., Othyr twoe groomes versours in this office to helpe to lodge theyre ale, to helpe drawe it [etc.].
▪ II. versor2|ˈvɜːsə(r)|
[a. L. type *versor, f. vers-, vertĕre to turn.]
†1. The needle of a compass. Obs. rare.
1640G. Watts tr. Bacon's Adv. Learn. v. ii. 229 So the versor of a Mariners needle applies it selfe to the Poles of the world.
2. Math. In quaternions, an operator which changes the direction of a vector without altering its length.
a1865Sir W. R. Hamilton Elem. Quaternions ii. i. (1866) 133 We shall now say that every Radial Quotient is a Versor. A Versor has thus, in general, a plane, an axis, and an angle. 1886W. S. Aldis Solid Geom. (ed. 4) xiv. 235 If the two vectors OA and OB be of equal length the change of one into the other is merely an operation of rotation. In this case the quaternion is called a versor. |
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