One of the mysteries of the English language finally explained.
1Of a polyhedron: composed of pairs of equal parallel faces of which equivalent points are connected by lines perpendicular to the faces. Now rare.
2Designating the triangle whose vertices are the feet of the altitudes of a given triangle.
3Soil Science. Of a soil: having the median characteristics of its type.
Late 19th century (in an earlier sense). From ancient Greek ὀρθός straight + -ic.
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