synecdoche
From LSJ
Ζῆν οὐκ ἄξιος, ὅτῳ μηδὲ εἷς ἐστι χρηστὸς φίλος → Life is not worth living if you do not have at least one friend.
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).
Latin > French (Gaffiot 2016)
sўnecdŏchē, ēs, f. (συνεκδοχή), synecdoque [figure de rhét.] : Quint. 8, 6, 18.