# 1911 Encyclopædia Britannica/Bisectrix

**BISECTRIX** (fem., of Lat. *bisector*, from *bi*-, two, *secare*, to cut), in geometry, the same as bisector, *i.e.* a point which divides a line, or a line which divides an angle, into two equal parts; in crystallography it denotes the bisector of the angle between the optic axes.