elimination rate

https://doi.org/10.1351/goldbook.16238
Derivative with respect to time of the concentration or amount of a substance in the body, or a part thereof, resulting from elimination.
Source:
PAC, 2007, 79, 1583. (Explanatory dictionary of key terms in toxicology (IUPAC Recommendations 2007)) on page 1612 [Terms] [Paper]