ἰός

A. poison, as of serpents, A. Eu. 478, S. Tr. 771, E. Ion 1015, Plu. 2.562c, etc.; venom of a mad dog, Ruf. Fr. 118; ἰὸς ἀμεμφὴς μελισσῶν, of honey with which snakes fed Iamos, Pi. O. 6.47: metaph., of envy, A. Ag. 834. (Cf. Skt. vi[snull ]ám 'poison', Lat. vīrus.)