/ ˈvɪnɪgə(r); NAmE / noun
[ U ] a liquid with a bitter taste made from malt (= a type of grain) or wine, used to add flavour to food or to preserve it :
malt / wine vinegar
onions pickled in vinegar
—see also balsamic vinegar
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WORD ORIGIN
Middle English : from Old French vyn egre , based on Latin vinum wine + acer sour.