ἑπταμόριον
From LSJ
τοῖς οἰκείοις βουλεύμασιν ἁλίσκεσθαι → hoist by one's own petard, hoist with one's own petard, hoist on one's own petard, hoisted by one's own petard, be hoist with one's own petard
English (LSJ)
τό, = Lat.
A Septempagi, Plu.Rom.25.
German (Pape)
[Seite 1013] τό, das Siebentheil; bei Plut. Rom. 24 das lat. Septempagium, wofür ἑπταόριον, septimontium, vorgeschlagen ist.