A chemical substance that typically has a sour taste and is capable of turning litmus paper red, reacting with bases and certain metals to form salts. noun
Lemon juice is an example of an acid because it contains citric acid.
The scientist added acid to the solution to test its reactivity.
A slang term for the hallucinogenic drug LSD (lysergic acid diethylamide). noun
He claimed he saw vivid colors and patterns after taking acid.
The music festival was known for its association with acid culture.
Having a sharp or biting taste or smell; sour. adjective
The unripe fruit had an acid flavor that made it hard to eat.
There was an acid smell in the air after the chemical spill.
Sharp, biting, or cutting in tone or manner; sarcastic. adjective
Her acid remarks during the meeting left everyone in silence.
The critic's acid review of the film discouraged many from watching it.