* Toxic: Meaning poisonous or harmful.
* Toxicity: The quality or degree of being poisonous.
* Toxicology: The study of poisons and their effects.
* Antitoxin: An antibody that counteracts a specific toxin.
* Toxemia: The presence of toxins in the blood.
* Toxoid: A toxin that has been treated to reduce its toxicity but still retains its ability to stimulate an immune response.
* Toxoplasmosis: A parasitic disease caused by the protozoan Toxoplasma gondii.
These words all derive from the Greek word "toxikon," which originally referred to a poison used on arrows.