Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Chemistry Any of a class of substances whose aqueous solutions are characterized by a sour taste, the ability to turn blue litmus red, and the ability to react with bases and certain metals to form salts.
  • n. Chemistry A substance that yields hydrogen ions when dissolved in water.
  • n. Chemistry A substance that can act as a proton donor.
  • n. Chemistry A substance that can accept a pair of electrons to form a covalent bond.
  • n. A substance having a sour taste.
  • n. The quality of being sarcastic, bitter, or scornful: wrote with acid about her first marriage.
  • n. Slang See LSD1.
  • adj. Chemistry Of, relating to, or containing an acid.
  • adj. Chemistry Having a high concentration of acid.
  • adj. Chemistry Having the characteristics of an acid.
  • adj. Having a pH of less than 7.
  • adj. Having a relatively high concentration of hydrogen ions.
  • adj. Geology Containing a large proportion of silica: acid rocks.
  • adj. Having a sour taste. See Synonyms at sour.
  • adj. Biting, sarcastic, or scornful: an acid wit; an acid tone of voice.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Sour, sharp, or biting to the taste; tart; having the taste of vinegar.
  • adj. Sour-tempered.
  • adj. Of or pertaining to an acid; acidic.
  • adj. Denoting a musical genre that is a distortion (as if hallucinogenic) of an existing genre, as in acid house, acid jazz, acid rock.
  • n. A sour substance.
  • n. Any of several classes of compound having the following properties:-
  • n. lysergic acid diethylamide

from the GNU version of the Collaborative International Dictionary of English

  • adj. Sour, sharp, or biting to the taste; tart; having the taste of vinegar: as, acid fruits or liquors. Also fig.: Sour-tempered.
  • adj. Of or pertaining to an acid.
  • n. A sour substance.
  • n. 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.

from The Century Dictionary and Cyclopedia

  • Sour, sharp, or biting to the taste; tasting like vinegar: as, acid fruits or liquors.
  • n. Originally, a substance possessing a sour taste like that of vinegar; in modern chemical use, a name given to a large number of compounds which do not necessarily possess this property.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. street name for lysergic acid diethylamide
  • n. 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
  • adj. harsh or corrosive in tone
  • adj. being sour to the taste
  • adj. having the characteristics of an acid

Etymologies

From Latin acidus, sour, from acēre, to be sour; see ak- in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From French acide, from Latin acidus ("sour, acid"), from aceō ("I am sour"). (Wiktionary)

Examples

Comments

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  • 1906 US Railway Assn. Standard Cipher Code meaning "action taken is satisfactory".

    January 19, 2013