synecdoche
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
Latin > English (Lewis & Short)
synecdŏchē: ēs, f., = συνεκδοχή,>
I a figure of speech by which a part is put for the whole, the cause for the effect, or the contrary, a proper for a common noun, etc., synecdoche, Quint. 8, 6, 18 sq.; 8, 6, 28; Charis. p. 245 P.; Diom. p. 453 ib. (Quint. 9, 3, 58, written as Greek).