a sour-tasting liquid consisting of impure dilute acetic acid, made by oxidation of the ethyl alcohol in beer, wine, or cider. It is used as a condiment or preservative
2.
sourness or peevishness of temper, countenance, speech, etc
3.
pharmacol a medicinal solution in dilute acetic acid
4.
informal (US), (Canadian) vitality
—vb
5.
(tr) to apply vinegar to
[C13: from Old French vinaigre, from vinwine + aigre sour, from Latin acer sharp]