noun
orthocenter
Geometry term: the intersection point of the three altitudes of a triangle.
三角形の垂心は、各頂点から対辺に下ろした垂線の交点です。
The orthocenter of a triangle is the intersection of the perpendicular lines drawn from each vertex to the opposite side.
内心 is the incenter (intersection of angle bisectors), while 垂心 is the orthocenter.
From 垂 (vertical, hanging) + 心 (center), a calque of the English 'orthocenter' or German 'Orthozentrum'.