Bisector
A bisector is something that cuts an object into two equal parts. It is applied to angles and line segments.
In verb form, we say that it bisects the other object.
1. Angle bisector
A line that cuts an angle into two equal parts.
In the figure below the blue line bisects the angle LJM. The blue line is the bisector.
For more on this see Angle bisector.
2. Line segment bisector
A line which cuts another line segment into two equal parts.
In the figure below, the line segment AB is the bisector. It bisects the line PQ  dividing it into two equal parts.
For more on this see Line bisector.
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