Acetic a. : Of a pertaining to vinegar; producing vinegar; producing vinegar; as, acetic fermentation.

Acetic 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.

Example:
How can Acetic acid be concentrated at home?

Taxonomy
acetic acid, acetate, glacial acetic acid, vinegar production, CH3COOH, methanol carbonylation, solvent, bacteria, Acetic anhydride, reaction, H2O, catalyst, metal, oxidation, ethylene, application, corrosive, Acetobacter.

Defination from the web:
Acetic acid, CH3COOH, also known as ethanoic acid, is an organic acid which gives vinegar its sour taste and pungent smell. ... Acetic acid is one of the simplest carboxylic acids. ... In the food industry acetic acid is used under the food additive code E260 as an acidity regulator. ...