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Noun: orthocenter  'or-thow,sen-tur
Usage: US (elsewhere: orthocentre)
  1. The point at which the perpendiculars from the angles of a triangle intersect
    "The students learned how to locate the orthocenter of a triangle in their geometry class";
    - orthocentre [Brit, Cdn]

Derived forms: orthocenters

Encyclopedia: Orthocenter