absorption coefficient

in biology
https://doi.org/10.1351/goldbook.AT06797
Ratio of the absorbed quantity (@UT06806@) of a substance to the administered quantity (intake).
Source:
PAC, 2004, 76, 1033. (Glossary of terms used in toxicokinetics (IUPAC Recommendations 2003)) on page 1036 [Terms] [Paper]