What is the meaning of poison?

noun

• Any substance that causes injury or illness or death of a living organism.
  • synonyms: toxicant, poisonous substance
• Anything that harms or destroys.
  • usage: "the poison of fascism"

verb

• Spoil as if by poison.
  • usage: "poison someone's mind"; "poison the atmosphere in the office"
• Kill with poison.
  • usage: "She poisoned her husband"
• Add poison to.
  • usage: "Her husband poisoned her drink in order to kill her"
  • synonyms: envenom
• Kill by its poison.
  • usage: "This mushrooms can poison"
• Administer poison to.
  • usage: "She poisoned her husband but he did not die"