Saliva

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late Middle English: from Latin.

wiktionary

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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

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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.)).