acid
//ˈæsɪd//
Noun
acidsPlural
1
A chemical substance that has a pH of less than 7, tastes sour, and can react with bases and certain metals
Lemon juice contains citric acid.
2
The drug LSD (lysergic acid diethylamide), a hallucinogenic substance
He experimented with acid in the 1960s.
Adjective
1
Having a sour, sharp, or biting taste
The lemon has an acid taste.
2
Sharp or biting in tone or manner; harsh or critical
She made an acid remark about his work.