Sour, sharp, or biting to the taste; tart; having the taste of vinegar. / (figuratively) Sour-tempered. / Of or pertaining to an acid; acidic.

A sour substance. / Any compound which yields H+ ions (protons) when dissolved in water; an Arrhenius acid. / Any compound that easily donates protons to a base; a Brønsted acid.

(chemistry) Having a pH less than 7, or being sour, or having the strength to neutralize alkalis, or turning a litmus paper red. / (mineralogy) Containing a high percentage of silica; opposed to basic.

The quality or state of being acid. / Sourness; tartness; sharpness to the taste. / (pathology) Excessive acid quality, as in gastric secretions.

(databases) Acronym of atomicity, consistency, isolation, and durability, a set of properties that guarantee database transactions are processed reliably.

plural of acidity

(idiomatic, informal) Exaggerated, bizarre or unpredictable. / Used other than figuratively or idiomatically: see on, acid.

The process of acidizing.

acidity, sourness

plural of acid