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
ὀκτάπεδος, -ον (α)
(δωρ. τ.) οκτάπους.
[ΕΤΥΜΟΛ. < ὀκτα- (βλ. λ. οκτώ) + -πεδος (< πέζα, δωρ. τ. για τη λ. πους), πρβλ. εξάπεδος].