Acid may refer to—

• a chemical compound generally defined by its reactions with complementary chemicals, designated bases.
• a slang term for a drug also called LSD or D-Lysergic Acid Diethylamide (C₂₀H₂₅N₃O). It is a powerful synthetic hallucinogen and psychedelic entheogen originally derived from ergot fungus.
• a form of electronic music that is most easily described as the sound made by a Roland TB-303 music synthesizer, and is where the term Acid House originates. It is a very important term in electronic music, often confused with the LSD reference.
• Acid rock, a form of psychedelic music.

In the computer art scene, ACiD is an acronym for ANSI Creators in Demand; a group which creates and distributes digital art and related software programs.

ACID is the acronym for Atomicity, Consistency, Isolation, and Durability, which are considered to be the key transaction processing features of a database management system, or DBMS.

ACID or Acid Music is the name of loop-based music production software originally published by Sonic Foundry but is now owned and run by Sony. This software is run on Microsoft PC's. It is a powerful audio editing tool that can stretch or compress sound without altering its pitch.

Acid rock may refer to:

• a genre of music, psychedelic rock.
• a type of rock in geology, felsic rocks.

See also

• Acid rock