Webster's Revised Unabridged Dictionary · 1913

Envenom

Envenom , transitive verb

[Old English envenimen, French envenimer; pref. en- (Latin in) + French venin poison. See Venom.]

1.
To taint or impregnate with venom, or any substance noxious to life; to poison; to render dangerous or deadly by poison, as food, drink, a weapon; as, envenomed meat, wine, or arrow; also, to poison (a person) by impregnating with venom.
Alcides... felt the envenomed robe. — Milton
O, what a world is this, when what is comely Envenoms him that bears it! — Shakespeare
2.
To taint or impregnate with bitterness, malice, or hatred; to imbue as with venom; to imbitter.
The envenomed tongue of calumny. — Smollett
On the question of slavery opinion has of late years been peculiarly envenomed. — Sir G. C. Lewis