Extended Strong's Greek Lexicon (Abbott-Smith based)
poison/rust
Usage: ἰός, -οῦ, ὁ [in LXX: Eze.24:6, 11-12 (חֶלְאָה), Psa.140:3 (חֵמָה), al. ;] __1. an arrow. __2. rust (Ez, l.with): Jas.5:3 (cf. MM, Exp., xv). __3. poison: figuratively, Rom.3:13 (Ps. l.with), Jas.3:8.† (AS)