acetic

adj. of or pertaining to acetic acid or vinegar, containing acetic acid or vinegar

Acetic acid, also known as ethanoic acid, is an organic chemical compound best recognized for giving vinegar its sour taste and pungent smell. Its structural formula is represented as CH3COOH. Pure, water-free acetic acid (glacial acetic acid) is a colourless liquid that attracts water from the environment (hygroscopy), and freezes below 16.7°C (62°F) to a colourless crystalline solid. Acetic acid is corrosive, and its vapour causes irritation to the eyes, a dry and burning nose, sore throat and congestion to the lungs. It is considered a weak acid due to the fact that at standard temperature and pressure the dissociated acid exists in equilibrium with the undissociated form in aqueous solutions, in contrast to strong acids, which are fully dissociated.
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Acetic /ace·tic/ pertaining to vinegar or its acid; sour. acetic pertaining to vinegar or its acid; sour. [more]Acetic - Community and Resources

Adjective
1. relating to or containing acetic acid
(pertainym) acetic acid, ethanoic acid

(a.)
Pertaining to, containing, or derived from, acetyl, as acetic ether, acetic acid. The latter is the acid to which the sour taste of vinegar is due.
  

(a.)
Of a pertaining to vinegar; producing vinegar; producing vinegar; as, acetic fermentation.