orthic
/ˈɔːθɪk/adjective
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.
3 Soil Science. Of a soil: having the median characteristics of its type.
Origin
Late 19th century (in an earlier sense). From ancient Greek ὀρθός straight + -ic.