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Definitions for Acid

[1] Chemistry . a compound usually having a sour taste and capable of neutralizing alkalis and reddening blue litmus paper, containing hydrogen that can be replaced by a metal or an electropositive group to form a salt, or containing an atom that can accept a pair of electrons from a base. Acids are proton donors that yield hydronium ions in water solution, or electron-pair acceptors that combine with electron-pair donors or bases.
[2] a substance with a sour taste.
[3] something, as a remark or piece of writing, that is sharp, sour, or ill-natured: His criticism was pure acid.
[4] Slang . LSD2.
[5] Chemistry . belonging or pertaining to acids or the anhydrides of acids. having only a part of the hydrogen of an acid replaced by a metal or its equivalent: an acid phosphate. having a pH value of less than 7. Compare alkaline(def 4) .
[6] sharp or biting to the taste; tasting like vinegar; sour: acid fruits.
[7] sharp, biting, or ill-natured in mood, manner, etc.: an acid remark; an acid wit.
[8] Geology . containing much silica.
[9] Metallurgy . noting, pertaining to, or made by a process in which the lining of the furnace, or the slag that is present, functions as an acid in high-temperature reactions in taking electrons from oxide ions: usually a siliceous material, as sand or ganister. Compare basic(def 3) .
[10] put on the acid , Australian Slang . to importune someone, as for money, sexual favors, or confidential information.
[11] any substance that dissociates in water to yield a sour corrosive solution containing hydrogen ions, having a pH of less than 7, and turning litmus red See also Lewis acid
[12] a sour-tasting substance
[13] a slang name for LSD
[14] chem of, derived from, or containing acid an acid radical being or having the properties of an acid sodium bicarbonate is an acid salt
[15] sharp or sour in taste
[16] cutting, sharp, or hurtful in speech, manner, etc; vitriolic; caustic
[17] (of rain, snow, etc) containing pollutant acids in solution
[18] (of igneous rocks) having a silica content of more than 60% of the total and containing at least one tenth quartz
[19] metallurgy of or made by a process in which the furnace or converter is lined with an acid material acid steel

Words related to Acid

biting, pungent, acerbic, piquant, acrid, trenchant, vitriolic, sarcastic, caustic, mordant, nasty, sharp, tart, corroding, dissolvent, dry, cutting, offensive, hallucinogen

Words nearby Acid

achylia, acicula, acicular, aciculate, aciculum, acid, acid anhydride, acid cell, acid deposition, acid drop, acid dust

Origin of Acid

1620–30; < Latin acidus sour, akin to ācer sharp, acētum vinegar, acescent, acicula

Words that may be confused with Acid

acerbic, acid, acrid

Other words from Acid

ac·id·ly , adverb
ac·id·ness , noun
non·ac·id , noun, adjective
pre·ac·id , adjective
pre·ac·id·ness , noun
sem·i·ac·id , adjective
acidic adjective

Word origin for Acid

C17: (first used by Francis Bacon): from French acide or Latin acidus, from acēre to be sour or sharp

Synonyms for Acid

acerbic, biting, piquant, pungent, sharp, tart, acidulous, vinegarish, vinegary