ἀχερωίς
From LSJ
οὐκ ἂν λάβοις παρὰ τοῦ μὴ ἔχοντος → you can't take from one who doesn't have, you can't squeeze blood out of a turnip, you can't get blood out of a turnip, you can't get blood from a stone, you can't get blood out of a stone
Greek (Liddell-Scott)
ἀχερωίς: -ίδος, ἡ, ἀλλαχοῦ καλουμένη λεύκη, Ἰλ. Ν. 389., Π. 482· (ἐκ τοῦ Ἀχέρων, διότι ἐπιστεύετο ὅτι ἐκομίσθη ἐκ τοῦ κάτω κόσμου ὑπό τοῦ Ἡρακλέους, Παυς. 5. 14, 2· πρβλ. Νικ. Ἀλεξιφ. 13, Ἀχ. ὄχθαι): «τὴν δὲ λεύκην πεφυκέναι φασὶ πρὸς τῷ Ἀχέροντι, ὅθεν καὶ ἀχερωΐδα καλεῖσθαι παρ’ Ὁμήρῳ» Ἁρπ. ἐν λέξει λεύκη.
English (Autenrieth)
white poplar, Il. 13.389. (Il.)
Middle Liddell
the white poplar, said to have been brought by Hercules from the banks of Acheron, Il.
