Strong's #2447: ios (pronounced ee-os')

perhaps from eimi (to go) or hiemi (to send); rust (as if emitted by metals); also venom (as emitted by serpents):--poison, rust.

Thayer's Greek Lexicon:

̓́

ios

1) poison (of animals)

1a) poison of asps is under their lips

1b) spoken of men given to reviling and calumniating and thereby injuring others

2) rust

Part of Speech: noun masculine

Relation: perhaps from eimi (to go) or hiemi (to send)

Citing in TDNT: 3:334, 368

Usage:

This word is used 3 times:

 

Romans 3:13: "with their tongues they have used deceit; the poison of asps is under their lips:"
James 3:8: "evil, full of deadly poison."
James 5:3: "is cankered; and the rust of them shall be a witness"