compartment

https://doi.org/10.1351/goldbook.14537
  1. Conceptualized part of the body (organs, tissues, cells, or fluids) considered as an independent system for purposes of modeling and assessment of distribution and clearance of a substance [1].
  2. Part of an ecosystem considered as an independent system for purposes of assessment of uptake, distribution, and dissipation of a substance.
Source:
PAC, 2009, 81, 829. (Glossary of terms used in ecotoxicology (IUPAC Recommendations 2009)) on page 859 [Terms] [Paper]