Date: 1601 a slimy membrane composed of yeast and bacterial cells that develops on the surface of alcoholic liquids undergoing acetous fermentation and is added to wine or cider to produce vinegar
MOTHER OF VINEGAR
Meaning of MOTHER OF VINEGAR in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012