A toxicant is a type of poison that is made by humans or introduced into the environment by human activity. This is in contrast to a toxin, which is a poison produced naturally by an organism (e.g. plant, animal, insect).
Some toxicants are specifically developed to fight pests, the so-called pesticides such as
- insecticides to kill insects
- herbicides to kill weeds,
- food conservation products to kill micro-organisms