acetous

The ancient chemists knew hardly any of the salts formed by the combinations of acetous acid with the salifiable bases, except the acetites of potash, soda, ammoniac, copper, and lead.

From Elements of Chemistry, In a New Systematic Order, Containing all the Modern Discoveries by Antoine Lavoisier

“Agatha might have more sense,” returned her acetous companion.

From A Forgotten Hero Not for Him by Emily Sarah Holt

In the doorway, looking a shade more acetous than usual, stood Lady Margaret.

From A Forgotten Hero Not for Him by Emily Sarah Holt

Thus the acetous acid, combined with vegetable alkali, forms a substance that is called the foliated earth of tartar; and it may be expelled from it by the vitriolic acid.

From Heads of Lectures on a Course of Experimental Philosophy: Particularly Including Chemistry by Joseph Priestley

And this is not all: corroded by the acetous acid, they are full of small holes, particularly in the cap, where all the vapors collect themselves, as in a reservoir.

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.