| acid | |
| 1. adj. Sour, sharp, or biting to the taste; tart; having the taste of vinegar. | |
| acid fruits or liquors | |
| 2. adj. (figuratively) Sour-tempered. | |
| 3. adj. Of or pertaining to an acid; acidic. | |
| 4. adj. (music) Denoting a musical genre that is a distortion (as if hallucinogenic) of an existing genre, as in acid house, acid jazz, acid rock. | |
| 5. n. A sour substance. | |
| 6. n. (chemistry) Any of several classes of compound having the following properties: | |
| 7. n. Any of a class of water-soluble compounds, having sour taste, that turn blue litmus red, and react with some metals to liberate hydrogen, and with base | |
| 8. n. Any compound that easily donates protons; a Brønsted acid | |
| 9. n. Any compound that can accept a pair of electrons to form a covalent bond; a Lewis acid | |
| 10. n. (slang) lysergic acid diethylamide (LSD) | |
