Definition - What does Toxin mean?
A toxin is a poisonous substance that is very unstable and toxic when introduced to human tissue. A toxin is a certain product of the metabolism of a living organism. These toxins interact with parts of the human body when they come into contact with, or are absorbed by tissue. Toxins vary in their effect on the body. Bee stings for example cause very minor effects while botulinum (the most toxic of all toxins) is immediately deadly.
Safeopedia explains Toxin
The safe handling of toxins may be regulated by federal agencies such as the Environmental Protection Agency (EPA), which provides information to help organizations deal with different varieties of toxins so that the general public can be protected from their effects. The EPA provides workplace safety programs to this effect. This includes advisory values for monitoring and treatment of water that is to be used with water utilities and so forth.