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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 form of fruit in the cycle of development of the Rusts or Brands, an order of fungi, formerly considered independent plants.

The angle between the chord of an aërocurve and the relative direction of the undisturbed air current.

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

One of the Ascidioidea, or in a more general sense, one of the Tunicata. Also as an adj.

The structure which unites together the ascidiozooids in a compound ascidian.

Shaped like an ascidian.

A group of Tunicata, often shaped like a two-necked bottle. The group includes, social, and compound species. The gill is a netlike structure within the oral aperture. The integument is usually leathery in texture. See Illustration in Appendix.

One of the individual members of a compound ascidian. See Ascidioidea.

A genus of simple ascidians, which formerly included most of the known species. It is sometimes used as a name for the Ascidioidea, or for all the Tunicata.

Destructive of bacteria.