ac·id ( s  d)n. 1. Chemistry a. Any of a class of substances whose aqueous solutions are characterized by a sour taste, the ability to turn blue litmus red, and the ability to react with bases and certain metals to form salts. b. A substance that yields hydrogen ions when dissolved in water. c. A substance that can act as a proton donor. d. A substance that can accept a pair of electrons to form a covalent bond. 2. A substance having a sour taste. 3. The quality of being sarcastic, bitter, or scornful: wrote with acid about her first marriage. 4. Slang See LSD1. adj. 1. Chemistry a. Of, relating to, or containing an acid. b. Having a high concentration of acid. c. Having the characteristics of an acid. 2. a. Having a pH of less than 7. b. Having a relatively high concentration of hydrogen ions. 3. Geology Containing a large proportion of silica: acid rocks. 4. Having a sour taste. See Synonyms at sour. 5. Biting, sarcastic, or scornful: an acid wit; an acid tone of voice. [From Latin acidus, sour, from ac  re, to be sour; see ak- in Indo-European roots.]ac id·ly adv.ac id·ness n. |
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