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

Derived forms: orthocentres

Encyclopedia: Orthocentre