Lowest concentration of a toxic substance in an environmental medium that kills individual organisms or test species under a defined set of conditions. Synonymous with lowest lethal concentration found.
Source:
PAC, 1993, 65, 2003. 'Glossary for chemists of terms used in toxicology (IUPAC Recommendations 1993)' on page 2071 (https://doi.org/10.1351/pac199365092003)