Etymology
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saliva (n.)

early 15c., from French salive, from Latin saliva "spittle," of unknown origin (perhaps, as Tucker suggests, somehow derived from the base of sallow (adj.)).

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Definitions of saliva

saliva (n.)
a clear liquid secreted into the mouth by the salivary glands and mucous glands of the mouth; moistens the mouth and starts the digestion of starches;
Synonyms: spit / spittle
From wordnet.princeton.edu