orthocenter

noun
or·tho·cen·ter | \ˈȯr-thə-ˌsen-tər \

Definition of orthocenter 

: the common intersection of the three altitudes of a triangle or their extensions or of the several altitudes of a polyhedron provided these latter exist and meet in a point

First Known Use of orthocenter

1866, in the meaning defined above

History and Etymology for orthocenter

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The first known use of orthocenter was in 1866

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