出典:Wiktionary
Alteration of dialectal spattle (by association with spit (noun)), from 古期英語 spātl, which is related to spǣtan (whence spit (verb)).
spittle (countable かつ uncountable, 複数形 spittles)
spittle (countable かつ uncountable, 複数形 spittles)
Representing a frequentative form of spit (“a spade's depth”), equivalent to spit + -le.