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orthocenter

[awr-thuh-sen-ter] /ˈɔr θəˌsɛn tər/
noun, Geometry
1.
the point of intersection of the three altitudes of a triangle.
Origin
1865-1870
1865-70; ortho- + center
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for orthocenter

orthocentre

/ˈɔːθəʊˌsɛntə/
noun
1.
the point of intersection of any two altitudes of a triangle
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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