ὀρθογώνιον
From LSJ
Ἡ δ' ἐμὴ ψυχὴ πάλαι τέθνηκεν, ὥστε τοῖς θανοῦσιν ὠφελεῖν → My soul died long ago so that I could give some help to the dead
English (LSJ)
τό, rectangle, Arist.de An.413a17; ὀρθό-ιος, ον, rectangular, Archyt. ap. Simp. in Cat.392.8; τρίγωνον Ti.Locr.98a, D.L.8.12; κῶνος Archim.Sph. Cyl.1 Prooemia ; ἐξ ὀρθογωνίου by rectangular measurement, PSI4.320.12 (i A. D.), POxy.2134.15 (ii A. D.).
