A sour substance.
Any of several classes of compound having the following properties:
Lysergic acid diethylamide (LSD)
Sour, sharp, or biting to the taste; tart; having the taste of vinegar.
Sour-tempered.
Of or pertaining to an acid; acidic.
Denoting a musical genre that is a distortion (as if hallucinogenic) of an existing genre, as in acid house, acid jazz, acid rock.