acid


acid
n. & adj.
—n.
1 Chem. a any of a class of substances that liberate hydrogen ions in water, are usu. sour and corrosive, turn litmus red, and have a pH of less than 7. b any compound or atom donating protons.
2 (in general use) any sour substance.
3 sl. the drug LSD.
—adj.
1 sharp-tasting, sour.
2 biting, sharp (an acid wit).
3 Chem. having the essential properties of an acid.
4 Geol. containing much silica.
5 (of a colour) intense, bright.
Phrases and idioms:
acid drop Brit. a kind of sweet with a sharp taste. acid-head sl. a user of the drug LSD. acid house a kind of synthesized music with a simple repetitive beat, often associated with the taking of hallucinogenic drugs. acid radical one formed by the removal of hydrogen ions from an acid. acid rain acid formed in the atmosphere esp. from industrial waste gases and falling with rain. acid test
1 a severe or conclusive test.
2 a test in which acid is used to test for gold etc. put the acid on Austral. sl. seek to extract a loan or favour etc. from.
Derivatives:
acidic adj. acidimeter n. acidimetry n. acidly adv. acidness n.
Etymology: F acide or L acidus f. acere be sour

Useful english dictionary. 2012.

Synonyms:

Look at other dictionaries:

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  • acid — Since the 1960s, when acid was first used to mean the hallucinogenic drug LSD, the word has developed all the connotations of a subculture. Those taking drugs came to be called acid heads or acid freaks; and their way of life came to depend on… …   Modern English usage

  • ACiD — Productions ACiD Productions (ACiD) est un groupe artistique et numérique underground. Fondé en 1990, le groupe était à l origine spécialisé dans le graphisme ANSI pour les BBS. Plus récemment, ils ont étendu leur domaine d application vers d… …   Wikipédia en Français

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  • acid — [adj1] bitter, sour in taste acerbic, acidulous, biting, piquant, pungent, sharp, tart, vinegarish, vinegary; concept 613 Ant. bland, sweet acid [adj2] having acidic, corrosive properties acerbic, acidulous, acrid, anti alkaline, biting,… …   New thesaurus

  • Acid — Ac id, a. [L. acidus sour, fr. the root ak to be sharp: cf. F. acide. Cf. {Acute}.] 1. Sour, sharp, or biting to the taste; tart; having the taste of vinegar: as, acid fruits or liquors. Also fig.: Sour tempered. [1913 Webster] He was stern and… …   The Collaborative International Dictionary of English

  • Acid — Ac id, n. 1. A sour substance. [1913 Webster] 2. (Chem.) 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… …   The Collaborative International Dictionary of English

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  • acid — [as′id] adj. [L acidus, sour < IE base * ak̑ , sharp, pointed > EAR2] 1. sharp and biting to the taste; sour; tart 2. sharp or sarcastic in temperament or speech 3. that is, or has the properties of, an acid 4. having too heavy a… …   English World dictionary

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