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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.

er the Bessemer or the open-hearth process in which the converter or hearth is lined with acid, that is, highly siliceous, material. Opposed to basic process.

Containing a high percentage of silica; -- opposed to basic. an acidic solution.

Containing or yielding an acid.

Capable of being acidified, or converted into an acid.

Producing acidity; converting into an acid. Dana.

The act or process of acidifying, or changing into an acid.

A simple or compound principle, whose presence is necessary to produce acidity, as oxygen, chlorine, bromine, iodine, etc.

To make acid; to convert into an acid; as, to acidify sugar.

An instrument for ascertaining the strength of acids. Ure.

The measurement of the strength of acids, especially by a chemical process based on the law of chemical combinations, or the fact that, to produce a complete reaction, a certain definite weight of reagent is required. -- Ac`id*i*met"ric*al, a.

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.

A remedy for acidity of the stomach, as an alkali or absorbent. -- a.

A white, crystalline substance,

hich can be replaced by negative atoms or radicals to form salts; -- said of bases. See Diacid.