Vinegar is an acidic liquid produced from the fermentation of ethanol in a process that yields its key ingredient, acetic acid (ethanoic acid). It also may come in a diluted form. The acetic acid concentration typically ranges from 4% to 8% by volume for table vinegar and up to 18% for pickling.
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vinegar A sour liquid formed by the fermentation of alcohol with acetic acid bacteria used as a condiment or preservative.