A sour substance.
LSD, lysergic acid diethylamide.
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.
Any compound that can accept a pair of electrons to form a covalent bond; a Lewis acid.
Any corrosive substance.
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.
Deceit or neglect.
Insincerity, irony, or sarcasm.
Indirection.
Backwardness of direction.
The use of a backward flip of the hand.
Leftward slant.