What does acid mean?

Definitions for acidˈæs ɪd

Here are all the possible meanings and translations of the word acid.

Princeton's WordNet

  1. acid(noun)

    any of various water-soluble compounds having a sour taste and capable of turning litmus red and reacting with a base to form a salt

  2. acid, back breaker, battery-acid, dose, dot, Elvis, loony toons, Lucy in the sky with diamonds, pane, superman, window pane, Zen(adj)

    street name for lysergic acid diethylamide

  3. acerb, acerbic, acid, acrid, bitter, blistering, caustic, sulfurous, sulphurous, virulent, vitriolic(adj)

    harsh or corrosive in tone

    "an acerbic tone piercing otherwise flowery prose"; "a barrage of acid comments"; "her acrid remarks make her many enemies"; "bitter words"; "blistering criticism"; "caustic jokes about political assassination, talk-show hosts and medical ethics"; "a sulfurous denunciation"; "a vitriolic critique"

  4. acidic, acid, acidulent, acidulous(adj)

    being sour to the taste

  5. acid(adj)

    having the characteristics of an acid

    "an acid reaction"


  1. acid(Noun)

    A sour substance.

  2. acid(Noun)

    Any of several classes of compound having the following properties:-

  3. acid(Noun)

    lysergic acid diethylamide

  4. acid(Adjective)

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

    acid fruits or liquors

  5. acid(Adjective)


  6. acid(Adjective)

    Of or pertaining to an acid; acidic.

  7. acid(Adjective)

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

  8. Origin: From acide, from acidus, from aceo.

Webster Dictionary

  1. Acid(adj)

    sour, sharp, or biting to the taste; tart; having the taste of vinegar: as, acid fruits or liquors. Also fig.: Sour-tempered

  2. Acid(adj)

    of or pertaining to an acid; as, acid reaction

  3. Acid(noun)

    a sour substance

  4. Acid(noun)

    one of a class of compounds, generally but not always distinguished by their sour taste, solubility in water, and reddening of vegetable blue or violet colors. They are also characterized by the power of destroying the distinctive properties of alkalies or bases, combining with them to form salts, at the same time losing their own peculiar properties. They all contain hydrogen, united with a more negative element or radical, either alone, or more generally with oxygen, and take their names from this negative element or radical. Those which contain no oxygen are sometimes called hydracids in distinction from the others which are called oxygen acids or oxacids

  5. Origin: [L. acidus sour, fr. the root ak to be sharp: cf. F. acide. Cf. Acute.]


  1. Acid

    An acid is a substance which reacts with a base. Commonly, acids can be identified as tasting sour, reacting with metals such as calcium, and reacting with bases such as sodium carbonate. Aqueous acids have a pH under 7. Solutions with higher acidity have lower pH. Chemicals or substances having the property of an acid are said to be acidic. Common examples of acids include acetic acid, sulfuric acid, hydrochloric acid and tartaric acid. As these examples show, acids can be solutions or pure substances, and can be derived from solids, liquids, or gases. Strong acids and some concentrated weak acids are corrosive, but there are exceptions such as carboranes and boric acid. There are three common definitions for acids: the Arrhenius definition, the Brønsted-Lowry definition, and the Lewis definition. The Arrhenius definition defines acids as substances which increase the concentration of hydronium ions in solution. The Brønsted-Lowry definition is an expansion: an acid is a substance which can act as a proton donor, while a base acts as a proton acceptor. By this definition, any compound which can easily be deprotonated can be considered an acid. Examples include alcohols and amines which contain O-H or N-H fragments. Lewis acids are electron-pair acceptors, while Lewis bases donate an electron-pair. Examples of Lewis acids include all metal cations, and electron-deficient molecules such as boron trifluoride and aluminium trichloride.

Chambers 20th Century Dictionary

  1. Acid

    as′id, adj. sharp: sour.—n. a sour substance: (chem.) one of a class of substances, usually sour, which turn vegetable blues to red, and combine with alkalies, metallic oxides, &c. to form salts.—adj. Acid′ifiable, capable of being converted into an acid.—ns. Acidificā′tion; Acid′ity, the quality of being acid or sour—also Ac′idness.—v.t. Acid′ulate, to make slightly acid. [L. ac-ēre, to be sour—root ak, sharp.]

Suggested Resources

  1. acid

    The acid symbol -- In this Symbols.com article you will learn about the meaning of the acid symbol and its characteristic.

  2. ACID

    What does ACID stand for? -- Explore the various meanings for the ACID acronym on the Abbreviations.com website.

British National Corpus

  1. Spoken Corpus Frequency

    Rank popularity for the word 'acid' in Spoken Corpus Frequency: #2156

  2. Written Corpus Frequency

    Rank popularity for the word 'acid' in Written Corpus Frequency: #1978

  3. Nouns Frequency

    Rank popularity for the word 'acid' in Nouns Frequency: #783


  1. Chaldean Numerology

    The numerical value of acid in Chaldean Numerology is: 9

  2. Pythagorean Numerology

    The numerical value of acid in Pythagorean Numerology is: 8

Sample Sentences & Example Usage

  1. Steven Wright:

    If God dropped acid, would he see people?

  2. Ian Myles:

    [Palmitic acid] can be confused by the body with bacteria like E.Coli.

  3. Gary Shaw:

    We do n’t want any message to get out there that folic acid is a bad thing.

  4. Raymond Casciari:

    The saliva you secrete when chewing gum really has a calming effect on acid reflux.

  5. Taz Bhatia:

    It contains citric acid, which irritates the lining of your already-inflamed throat.

Images & Illustrations of acid

  1. acidacidacid

Translations for acid

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