bisector

[bahy-sek-ter, bahy-sek-]

Origin

noun Geometry.

a line or plane that bisects an angle or line segment.

Origin:
1860–65; bisect + -or²

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Bisector is always a great word to know.

So is zedonk. Does it mean:

the offspring of a zebra and a donkey.

a fool or simpleton; ninny.

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Collins

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.

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bisector

bi·sec·tor