κοινοτάφιον
From LSJ
εἰργάζοντο λογάδην φέροντες λίθους καὶ ξυνετίθεσαν ὡς ἕκαστόν τι ξυμβαίνοι → they went to work bringing the stones as they picked them out and put them together as each one happened to fit
English (LSJ)
[ᾰ], τό, A public grave, Ulp.ad D.18.208 (p.111 Dobson).
German (Pape)
[Seite 1469] τό, gemeinsames Grab, Sp.