Definition of "acid" in English

adjective

1. Sour, sharp, or biting to the taste; tart; having the taste of vinegar.

   • acid fruits or liquors

2. (figuratively) Sour-tempered.

   • His response was harsh and acid.

3. Of or pertaining to an acid; acidic.

   • acid soils

4. (music) Denoting a musical genre that is a distortion (as if hallucinogenic) of an existing genre, as in acid house, acid jazz, acid rock.

noun

1. A sour substance.

2. Any compound which yields H+ ions (protons) when dissolved in water; an Arrhenius acid.

3. Any compound that easily donates protons to a base; a Brønsted acid.

4. Any compound that can accept a pair of electrons to form a covalent bond; a Lewis acid.

5. Any corrosive substance.

6. (uncountable, slang) LSD, lysergic acid diethylamide.