ὑπερασπιστής
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)
οῦ, ὁ,
A one who holds a shield over, protector, champion, ib.2,30, al., cf. Ph.1.374: fem. ὑπερασπ-ίστρια, ἡ, LXX 4 Ma.15.29 (-ίστεια cod.A).