OXFORD DICTIONARY
vinegar, n.
1 a sour liquid obtained from wine, cider, etc., by fermentation and used as a condiment or for pickling.
2 sour behaviour or character.
vinegarish adj. vinegary adj.
ME f. OF vyn egre ult. f. L vinum wine + acer, acre sour
THESAURUS
vinegar
acid, acidulant, bread-and-butter pickle, brine, chokecherry, crab apple, dill pickle, embalming fluid, formaldehyde, green apple, lemon, lime, pickle, preservative, preservative medium, salt, sour, sour balls, sour cream, sour grapes, sour pickle, sourdough, verjuice, yogurt
ROGET THESAURUS
vinegar
Sourness
N
sourness, acid, acidity, low pH, acetous fermentation, lactic fermentation,
vinegar, verjuice, crab, alum, acetic acid, lactic acid, sour, acid, acidulous, acidulated, tart, crabbed, acetous, acetose, acerb, acetic, sour as
vinegar, sourish, acescent, subacid, styptic, hard, rough, sour as a lemon, (4) Odor.