A bisector cuts something in half.
An angle bisector is a line which cuts a given angle in half.
The perpendicular bisector of a line segment is the line which cuts the given segment in half and is at right angles to it.
Glossary
Bisector
A bisector cuts something in half.
An angle bisector is a line which cuts a given angle in half.
The perpendicular bisector of a line segment is the line which cuts the given segment in half and is at right angles to it.