Webster's English Dictionary

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vinegar

vin.e.gar \'vin-i-g*r\ n [ME vinegre, fr. OF vinaigre, fr. vin wine (fr. L 
   vinum]) + aigre keen, sour - more at EAGER 1: a sour liquid obtained by 
   acetic fermentation of dilute alcoholic liquid s and used as a condiment or 
   preservative 2: disagreeableness in speech, disposition, or attitude  3: 
   VIM