Saliva (noun)

The watery secretion produced in the mouths of animals, including humans, that helps to moisten and clean the mouth and starts the process of digestion.

Origin:

From the latin word "saliva" meaning "spittle".

Examples:

1. Saliva is necessary for the proper functioning of the mouth.
2. Saliva is produced in the salivary glands.
3. Saliva plays an important role in digestion.
4. Saliva helps to keep the mouth moist.
5. Saliva contains enzymes that help to break down food.