median narcotic dose, \(\text{ND}_{50}\)

https://doi.org/10.1351/goldbook.M03813
Statistically derived @[email protected] of a substance expected to cause narcosis in 50% of test animals under a defined set of conditions.
Source:
PAC, 1993, 65, 2003. (Glossary for chemists of terms used in toxicology (IUPAC Recommendations 1993)) on page 2068 [Terms] [Paper]