κοινοτάφιον
From LSJ
ἔνδον σκάπτε, ἔνδον ἡ πηγή τοῦ ἀγαθοῦ καί ἀεί ἀναβλύειν δυναμένη, ἐάν ἀεί σκάπτῃς → Dig within. Within is the wellspring of Good; and it is always ready to bubble up, if you just dig. | Look within. Within is the fountain of the good, and it will ever bubble up, if thou wilt ever dig.
English (LSJ)
[ᾰ], τό, public grave, Ulp.ad D.18.208 (p.111 Dobson).
German (Pape)
[Seite 1469] τό, gemeinsames Grab, Sp.