acid

noun

(chemistry) Any compound which yields H+ ions (protons) when dissolved in water; an Arrhenius acid.

(chemistry) Any compound that easily donates protons to a base; a Brønsted acid.

(chemistry) Any compound that can accept a pair of electrons to form a covalent bond; a Lewis acid.

A sour substance.

Any corrosive substance.

(uncountable, slang) LSD, lysergic acid diethylamide.

(databases) Acronym of atomicity, consistency, isolation, and durability, a set of properties that guarantee database transactions are processed reliably. [(countable, chemistry) The number of atoms in a molecule.]

adjective

Of or pertaining to an acid; acidic.

Sour, sharp, or biting to the taste; tart; having the taste of vinegar.

(figuratively) Sour-tempered.

(music) Denoting a musical genre that is a distortion (as if hallucinogenic) of an existing genre, as in acid house, acid jazz, acid rock.

Roots

acidusacid- · Latin · sour, sharp

Synonyms for acid

acidicadj nonacidadj acidulentadj acidulousadj hyperacid oxyacidn causticadj hydracid aceticadj subacidadj acerbicadj acidityn alkalin acerbadj acridadj acetousadj acidulantadj vitriolicadj

Synonyms & related words for acid

Find synonyms, related words, and the definition of acid — including acidic, nonacid, acidulent, acidulous, hyperacid, oxyacid. Dendril is a free visual thesaurus that shows them on an interactive map where stronger matches sit closer to the center — no signup, no ads.

Words related to acid

Explore words related to acid — words associated with it, words that go with it, and its nearest matches in meaning. Related words include triacid, aciduria, diacid, monacid, pyrogallate, sulfurous, malonylurea, monoacid. Click any word to make it the center of the map and keep exploring the web of connections.

Synonyms for acid

Common synonyms for acid include acidic, nonacid, acidulent, acidulous, hyperacid, oxyacid, caustic, hydracid — words that share a close meaning. Hover or tap any word on the map for its definition and part of speech.

Where does acid come from?

The word acid breaks down into one root of Latin origin: the root acid-, from Latin acidus (“sour, sharp”). Explore each root to see other English words built from the same source.