bisector

[bahy-sek-ter, bahy-sek-]
noun Geometry.
a line or plane that bisects an angle or line segment.

Origin:
1860–65; bisect + -or2

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World English Dictionary
bisector (baɪˈsɛktə)
 
n
1.  a straight line or plane that bisects an angle
2.  a line or plane that bisects another line

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

bisector
1864, from bi- + sector.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
For a more precise method, students can use the chord bisector method, described below.
Construct a perpendicular bisector to each of the four sides.
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