δροσόλιθος
From LSJ
Ἔοικα γοῦν τούτου γε σμικρῷ τινι αὐτῷ τούτῳ σοφώτερος εἶναι, ὅτι ἃ μὴ οἶδα οὐδὲ οἴομαι εἰδέναι → I seem, then, in just this little thing to be wiser than this man at any rate, that what I do not know I do not think I know either
English (LSJ)
ὁ, a gem, Isid.Etym.16.12.2.
Spanish (DGE)
-ου, ὁ un tipo de piedra preciosa Plin.HN 1.37.61, Isid.Etym.16.12.2.