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Latin word acetum comes from Proto-Indo-European *h₂ḱ-, and later Proto-Italic *akēō (Be sharp-tasting, be sour.)
*h₂ḱ- (Proto-Indo-European)
*akēō (Proto-Italic)
Be sharp-tasting, be sour.
aceo (Latin)
(figuratively, Late Latin) I am disagreeable.. (of wine) I am sour.
acetum (Latin)
(figuratively) wit, shrewdness. Vinegar.