poison

any substance that causes injury or illness or death of a living organism

anything that harms or destroys; "the poison of fascism"

spoil as if by poison; "poison someone's mind"; "poison the atmosphere in the office"

kill with poison; "She poisoned her husband"

add poison to; "Her husband poisoned her drink in order to kill her"

kill by its poison; "This mushrooms can poison"

administer poison to; "She poisoned her husband but he did not die"