Liddell–Scott–Jones: ἡμι-τρίγωνος

ἡμι-τρίγωνος [ῐ], hyperdor.ἁμ-,ον,

A. forming half a triangle,τρίγωνον, of the triangles made by drawing a perpendicular from an angle of an equilateral triangle, Speus. ap. Theol.Ar. 63 : neut. asSubst., Ti.Locr. 98a , Simp. in Cael. 561.13 .