Saliva
来自Big Physics
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late Middle English: from Latin.
wiktionary
A learned borrowing from Latin salīva(“spittle”), replacing or merging with Middle English salive, salve(“saliva”), from the same Latin source. Further origin uncertain. Perhaps from Proto-Indo-European *salw-, *sal-(“dirt, dirty”), cognate with Old English salu(“dark, dusky”). More at sallow.
etymonline
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.)).
