ῥαφανίς
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)
ῖδος, ἡ,
A radish, Raphanus sativus, Ar.Nu.981, Pl.544, Fr.253, Cratin.313, Eup.312, Thphr.HP1.2.7, Dsc.2.112, etc.: later ῥεφανίς, Philum.Ven.18.4, Gloss.; cf. ῥάφανος. II ῥ. ἀγρία charlock, Raphanus raphanistrum, Dsc.2.112, Plin.HN19.82. [-ῑς, ῖδος in all known passages, though Ath.2.56e says that ι is common.]