acetous

The act of making acetous or sour; the process of converting, or of becoming converted, into vinegar.

From Webster's Unabridged Dictionary by Noah Webster

If it stands too long, a second fermentation commences, bearing affinity to the acetous fermentation: your liquor is then spoiled, and will yield you but little matter of a bad quality—sometimes none at all.

From The South-West By a Yankee. In Two Volumes. Volume 1 by Joseph Holt Ingraham

Heartburn originates from the inactivity of the stomach, whence the aliment, instead of being subdued by digestion, and converted into chyle, runs into fermentation, producing acetous acid.

From Zoonomia, Vol. II Or, the Laws of Organic Life by Erasmus Darwin

The acetous acid has no action upon tin.

From The Art of Making Whiskey So As to Obtain a Better, Purer, Cheaper and Greater Quantity of Spirit, From a Given Quantity of Grain by C. M.

As many of the preceding observations relate to the vinous and putrefactive fermentations, I had the curiosity to endeavour to ascertain in what manner the air would be affected by the acetous fermentation.

From Experiments and Observations on Different Kinds of Air by Joseph Priestley