Poison refers to a substance that can cause illness or death when introduced into or absorbed by a living organism.
The term "poison" can also be used metaphorically to describe:
1. Something harmful or destructive to the mind or morals
2. A drink containing alcohol (slang)
3. In chemistry, a substance that inhibits or destroys the activity of a catalyst
4. In biology, a substance produced by an organism that is toxic to other species