Etymology
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spittle (n.)

"saliva, spit," late 15c., probably an alteration (by influence of spit (n.1)) of Old English spætl, spatl, from Proto-Germanic *spait- (source also of Old English spætan "to spit"), from PIE root *sp(y)eu- "to spew, spit" (see spew (v.)).

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Definitions of spittle

spittle (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: saliva / spit
From wordnet.princeton.edu