Scientific discipline involving the study of the actual or potential danger presented by the harmful effects of substances (poisons) on living organisms and ecosystems, of the relationship of such harmful effects to exposure, and of the mechanisms of action, diagnosis, prevention and treatment of intoxications, teadusharu, mis tegeleb mürgiste ainete organismidele ja ökosüsteemidele kahjuliku toime uurimisega (nt koguse, mõjuaja, toimemehhanismi, preventsiooni aspektist)