acid
adj//ˈæsɪd//sur, syra, syra-, acid
Sour, sharp, or biting to the taste; tart; having the taste of vinegar.
(figuratively) Sour-tempered.
Of or pertaining to an acid; acidic.
A sour substance.
(chemistry)
(uncountable, slang) LSD, lysergic acid diethylamide.