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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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