Poison - Vine's Expository Dictionary of New Testament Words
Poison[ 1,,G2447, ios ]
denotes something active" as
(a) "rust," as acting on metals, affecting their nature, James 5:3;
(b) "poison," as of asps, acting destructively on living tissues, figuratively of the evil use of the lips as the organs of speech, Romans 3:13; so of the tongue, James 3:8.