Saliva
Part of speech: noun
Definition: A clear, slightly alkaline liquid secreted into the mouth by the salivary glands and mucous glands, consisting of water, mucin, protein, and enzymes, It moistens the mouth, lubricates ingested food, and begins the breakdown of starches.
Example sentence: We're collecting about 100,000 telomere lengths in saliva samples and then looking at how those relate to both the extensive longitudinal clinical records that Kaiser is collecting and the genome sequence variations.
Spittle
Part of speech: noun
Definition: Spit, usually frothy and of a milky coloration.Something frothy and white that resembles spit.Spit-up or drool of an infant.