λιθάριον
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, Dim. of λίθος,
A stone, Thphr.HP3.7.5, Phld.Po.Herc.1675.5, Dsc.1.68, 5.40, PKlein.Form.303 (vi A.D.). 2 a gem, IG11(2).287 B46 (Delos, iii B.C.), Annuario 6/7.405 (Perge), PHolm.5.4, al. (Condemned by Phryn. 158.)
German (Pape)
[Seite 44] τό, dim. von λίθος, Steinchen, Theophr. u. Sp., vgl. Lob. zu Phryn. 180, wo das Wort als unattisch für λιθίδιον getadelt ist.