Liquids originating from the bodies of living or dead humans, animals, and other organisms.
Note: They include fluids that are excreted or secreted from the body.
Source:
PAC, 2018, 90, 1121. 'Terminology of bioanalytical methods (IUPAC Recommendations 2018)' on page 1124 (https://doi.org/10.1515/pac-2016-1120)