Clear, viscous secretion from the parotid, submaxillary, sublingual, and smaller mucous glands in the cavity of the mouth.
Note: Saliva contains many important substances, including electrolytes, mucus, antibacterial compounds and various enzymes.
Source:
PAC, 2018, 90, 1121. 'Terminology of bioanalytical methods (IUPAC Recommendations 2018)' on page 1126 (https://doi.org/10.1515/pac-2016-1120)