/buy sek"triks/ , n. , pl. bisectrices /buy'sek truy"seez/ .
1. Crystall. an imaginary line bisecting either the acute angle (acute bisectrix) or the obtuse angle (obtuse bisectrix) of the optic axes of a biaxial crystal.
2. Geom. a bisector.
[ 1850-55; BISEC(T) + -TRIX ]