← BackshareGuessacetous/əˈsiːtəs/adjectiveHaving a sour taste like vinegar; acidic.The salad dressing had an acetous tang that made it refreshing.The wine had turned acetous after being left open for too long.She wrinkled her nose at the acetous smell of the fermenting fruit.SynonymssouracidicvinegaryAntonymssweet