Definition of saliva
: a slightly alkaline secretion of water, mucin, protein, salts, and often a starch-splitting enzyme (such as ptyalin) that is secreted into the mouth by salivary glands, lubricates ingested food, and often begins the breakdown of starches
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Merriam-Webster unabridged
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Time Traveler for saliva
The first known use of saliva was in the 15th century
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