bisectrix
(baɪˈsɛktrɪks)
[f. prec.: see -trix.]
= prec.; spec. in biaxial polarization, the line bisecting the angle between the two axes of polarization (= linea bisectrix).
| 1854 Dana Min. Introd. 20 A line bisecting the..angle between these optical axes is called a bisectrix. |