(geometry) The intersection of the three lines that can be drawn flowing from the three corners of a triangle to a point along the opposite side where each line intersects that side at a 90 degree angle; in an acute triangle, it is inside the triangle; in an obtuse triangle, it is outside the triangle.

One of the major branches of Christianity; it comprises the Greek Orthodox Church, the Russian Orthodox Church and other patriarchates. / Any other Church that self-designates as Eastern and Orthodox

The Eastern Orthodox Church / The Eastern body of Christendom / That part of Christendom apart from the Eastern Catholic Churches / Any Church that self-designates as Orthodox

(mathematics) Either of a pair of functions whose inner product is zero

Synonym of orthodontics

Of or relating to the Greek Orthodox Church

A member of the Greek Orthodox Church

Alternative spelling of orthopedic

Alternative spelling of orthopedist

A group of Eastern Orthodox churches comprising the churches of Constantinople, Alexandria, Jerusalem, Cyprus and Greece.