γυπονέμεσις

From LSJ

εἰς τετρημένον πίθον ἀντλεῖν → run water into a punctured pitcher, to the perforated jar bale water, labour in vain, labor in vain

Source

Spanish (DGE)

-εως, ἡ cierto animal alado Hsch.s.u. γρῦπες.