| bisectrix | The line bisecting the angle between the optic axes of a biaxial crystal. Source: Websters Dictionary (01 Mar 1998) |
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| bisectrix, acute | <microscopy> In biaxial crystals, that principal axis of the ellipsoid of indexes which bisects the smaller angle between the optic axes. (05 Aug 1998) |
| bisectrix, obtuse | <microscopy> In biaxial crystals, that principal axis of the ellipsoid of indexes which bisects the larger angle between the optic axes. (05 Aug 1998) |