αἰγώνυχον
From LSJ
ἢ λέγε τι σιγῆς κρεῖττον ἢ σιγὴν ἔχε → either say something better than silence or keep silence (Menander)
Greek (Liddell-Scott)
αἰγώνυχον: τό, ὁ ὄνυξ τῆς αἰγός, φυτὸν τι, ὅπερ καὶ λιθόσπερμον ἐκαλεῖτο, Διοσκ.
Spanish (DGE)
-ου, τό
bot. mijo de sol, perlina, Lithospermum officinale L., Dsc.3.141 (var., cf. ἀετώνυχον), cf. Hsch.