What does the word poison mean?

Usage examples for poison

  1. But perhaps the poison was not strong enough. – Marguerite de Valois by Alexandre Dumas
  2. He could not avoid adding this last touch of the poison point. – Gunman's Reckoning by Max Brand
  3. But could we not poison this Dolfin, after all? – Hereward, The Last of the English by Charles Kingsley