A biscector splits something exactly in half. For instance, an angle bisector splits an angle into two equal smaller angles and a segment bisector splits a segment into two shorter equal segments.
5 Answers By Expert Tutors

Bill L. answered 02/20/20
18-year certified teacher offers math help: algebra thru calculus
A "bisector" in geometry can be either a segment bisector or an angle bisector.
A segment bisector is a segment, line, or ray that intersects the midpoint of the segment being bisected. The bisected segment is partitioned into 2 segments of equal length.
An angle bisector is a ray, segment, or line intersecting the vertex of the angle being bisected. The bisected angle is partitioned into 2 adjacent angles of equal measure.
Note that a bisector must be a segment, line, or ray. A midpoint, though it divides a segment in two, is simply called a midpoint, not a bisector.

Jasmin C. answered 10/20/13
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In geometry, a bisector is a line that divides EITHER another line or an angle into two equal parts.

Leonardo M. answered 11/05/19
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Both answer above are correct but not completely. In geometry a bisector is cutting an angle in 2 equal proportions.
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