ἡμιτρίγωνος
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, ap. Theol.Ar. 63 : neut. as Subst., , 98a in Cael. 561.13 .