Pronunciation: (vin'i-gur),[key] —n. 1. a sour liquid consisting of dilute and impure acetic acid, obtained by acetous fermentation from wine, cider, beer, ale, or the like: used as a condiment, preservative, etc.
2. Pharm.a solution of a medicinal substance in dilute acetic acid, or vinegar.
3. sour or irritable speech, manner, or countenance: a note of vinegar in his voice. 4. Informal.vigor; high spirits; vim.