poison definition

1. any substance that causes injury or illness or death of a living organism
2. anything that harms or destroys
• examples: the poison of fascism
3. spoil as if by poison
• examples: poison someone's mind
• examples: poison the atmosphere in the office
4. kill with poison
• examples: She poisoned her husband
5. add poison to
• examples: Her husband poisoned her drink in order to kill her
6. kill by its poison
• examples: This mushrooms can poison
7. administer poison to
• examples: She poisoned her husband but he did not die