Emily Dickinson Lexicon

VIN'E-GAR, n. [Fr. vin, wine, and aigre, sour.]

1. An acid liquor obtained from wine, cider, beer, &c. by the acetous fermentation. Vinegar may differ indefinitely in the degree of its acidity. When highly concentrated, it is called radical vinegar. The acid of vinegar is the acetic.
2. Any thing really or metaphorically sour. [Not in use.] – Shak. Vinegar of lead, liquor formed by digesting ceruse or litharge with a sufficient quantity of vinegar to dissolve it.