Poison
In medicine and zoology, toxins and venoms are different from poisons. Toxins are the result of a biological process. Venoms are substances which the organism uses to harm other species. Certain organisms use venoms for hunting, or as a defense. If an organism is 'poisonous', such as many mushrooms, it is harmful to eat. If it is 'venomous', like snakes or honeybees, it has a harmful bite or sting. For some very deadly bites humans have developed effective antivenoms.