ἐνέγγυον

From LSJ

γοῦν κυνικὸς Μένιππος ἁλμοπότιν τὴν Μύνδον φησίν (Athenaios 1.34e) → At any rate the Cynic (satirist) Menippus says that Myndus is a brine-drinking town.

Source

Spanish (DGE)

-ου, τό
seguridad, prueba, garantía πολλὰ γὰρ ἐνέγγυα τῆς οἰκείας δυνάμεως δεδωκώς Thdt.M.80.1496D.