vinegar

n. Sour liquid got from malt, wine, cider, etc., by fermentation and used as a condiment or for pickling.  vinegary adj. [french, = sour wine: related to *eager]

a. A sour liquid used as a condiment, or as a preservative, and obtained by the spontaneous (acetous) fermentation, or by the artificial oxidation, of wine, cider, beer, or the like.