The corpus record
ios2 · ὁ
poison, venom
Generated live from the audited corpus — every figure on this page is a database query, not prose from memory.
ἰός · ios — LSJ
poison, as of serpents, A. Eu. 478, S. Tr. 771, E. Ion 1015, Plu. Vind. 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. viṣám ‘poison’, Lat. vīrus.)
No etymology authority pointer is recorded for this lemma yet — an honest gap, not an omission. The etymological dictionaries (Beekes, Chantraine, Frisk) are matched incrementally.