Wordnet 3.0
NOUN (2)
1. 
 a dilute solution of acetic acid that is used as a solvent (e.g. for a drug); 
2. 
 sour-tasting liquid produced usually by oxidation of the alcohol in wine or cider and used as a condiment or food preservative; 
[syn: vinegar, acetum]
WordNet (r) 3.0 (2006):
acetum
    n 1: a dilute solution of acetic acid that is used as a solvent
         (e.g. for a drug)
    2: sour-tasting liquid produced usually by oxidation of the
       alcohol in wine or cider and used as a condiment or food
       preservative [syn: vinegar, acetum]