benchmark concentration

initialism: BMC
https://doi.org/10.1351/goldbook.16233
Statistical lower CL on the concentration that produces a defined response (called the benchmark response or BMR, usually \(\pu{5\%}\) or \(\pu{100\%}\)) for an adverse effect compared to background, defined as \(\pu{0\%}\).
benchmark concentration

Dose–response curve showing BMC and BMCL (BMC 10 % lower CL).

Source:
PAC, 2007, 79, 1583. (Explanatory dictionary of key terms in toxicology (IUPAC Recommendations 2007)) on page 1599 [Terms] [Paper]