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ENGLISH · A WORD WITH POSSIBILITIES

acid.

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

4 characters2 syllables approx.English language

Meaning & usage

adj/ˈæsɪd/Australia, Canada, General-American, Received-Pronunciation

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

    acid fruits or liquors

  2. Sour-tempered.

    figuratively
    His response was harsh and acid.

  3. Of or pertaining to an acid; acidic.

    acid soils

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

Where this word comes from

Etymology tree Proto-Indo-European *h₂eḱ- Proto-Indo-European *-éh₁ti Proto-Indo-European *-yeti Proto-Indo-European *-éh₁yeti Proto-Indo-European *h₂eḱéh₁yeti Proto-Italic *akēō Latin aceō Proto-Indo-European *dʰeh₁-der. Proto-Italic *-iðos Latin -idus Latin acidusbor. French acidebor. English acid From French acide, from Latin acidus (“sour, acid”), from aceō (“to be sour”). Doublet of agita.

noun/ˈæsɪd/Australia, Canada, General-American, Received-Pronunciation

  1. A sour substance.

    countable · uncountable

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

    countable · uncountable

  3. Any compound that easily donates protons to a base; a Brønsted acid.

    countable · uncountable

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

    countable · uncountable

  5. Any corrosive substance.

    countable · uncountable

  6. LSD, lysergic acid diethylamide.

    slang · uncountable
Where this word comes from

Etymology tree Proto-Indo-European *h₂eḱ- Proto-Indo-European *-éh₁ti Proto-Indo-European *-yeti Proto-Indo-European *-éh₁yeti Proto-Indo-European *h₂eḱéh₁yeti Proto-Italic *akēō Latin aceō Proto-Indo-European *dʰeh₁-der. Proto-Italic *-iðos Latin -idus Latin acidusbor. French acidebor. English acid From French acide, from Latin acidus (“sour, acid”), from aceō (“to be sour”). Doublet of agita.

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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.

Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.