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Sour or severe.

Sourness and harshness. [Obs.] Bailey.

Sourness of taste, with bitterness and astringency, like that of unripe fruit.

The quality of being acescent; the process of acetous fermentation; a moderate degree of sourness. Johnson.

Turning sour; readily becoming tart or acid; slightly sour. Faraday.

derived from, acetyl, as acetic ether, acetic acid. The latter is the acid to which the sour taste of vinegar is due.

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

Sour like vinegar; acetous.

The quality of being acetous; sourness.

Having a sour taste; sour; acid. "An acetous spirit." Boyle. "A liquid of an acetous kind." Bp. Lowth.

ain, or in continued pain; to be distressed. "My old bones ache." Shak. The sins that in your conscience ache. Keble.

in gaining; to win. Some are born great, some achieve greatness. Shak. Thou hast achieved our liberty. Milton.

Sour, sharp, or biting to the taste; tart; having the taste of vinegar: as, acid fruits or liquors. Also fig.: Sour-tempered. He was stern and his face as acid as ever. A. Trollope.

To sour; to imbitter. His thin existence all acidified into rage. Carlyle.

The quality of being sour; sourness; tartness; sharpness to the taste; as, the acidity of lemon juice.

Sourly; tartly.

Acidity; sourness.

To make sour or acid in a moderate degree; to sour somewhat. Arbuthnot.

Having an acid quality; sour; acidulous. "With anxious, acidulent face." Carlyle.

Slightly sour; sub-acid; sourish; as, an acidulous tincture. E. Burke. Acidulous mineral waters, such as contain carbonic anhydride.