Toxicity

1. (EM 1110-2-5026) A term describing the limit of intolerance of organisms to survive lethal chronic or short-term subjection to certain chemical and contaminating substances physical and environmental conditions. 2. The level of mortality by a group of organisms that have been affected by the properties of a substance, such as contaminated water, sediment, or dredged material. (US Army Corps of Engineers, Coastal and Hydraulics Laboratory Glossary, 2015)