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acid
[as-id]
noun
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.
a substance with a sour taste.
something, as a remark or piece of writing, that is sharp, sour, or ill-natured.
His criticism was pure acid.
Slang.LSD.
adjective
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.
sharp or biting to the taste; tasting like vinegar; sour.
acid fruits.
sharp, biting, or ill-natured in mood, manner, etc..
an acid remark; an acid wit.
Synonyms: , , ,Geology.containing much silica.
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.
acid
/ ˈæɪ /
noun
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
a sour-tasting substance
a slang name for LSD
adjective
chem
of, derived from, or containing acid
an acid radical
being or having the properties of an acid
sodium bicarbonate is an acid salt
sharp or sour in taste
cutting, sharp, or hurtful in speech, manner, etc; vitriolic; caustic
(of rain, snow, etc) containing pollutant acids in solution
(of igneous rocks) having a silica content of more than 60% of the total and containing at least one tenth quartz
metallurgy of or made by a process in which the furnace or converter is lined with an acid material
acid steel
acid
Any of a class of compounds that form hydrogen ions when dissolved in water, and whose aqueous solutions react with bases and certain metals to form salts. Acids turn blue litmus paper red and have a pH of less than 7. Their aqueous solutions have a sour taste.
Compare base
acid
A sour-tasting material (usually in a solution) that dissolves metals and other materials. Technically, a material that produces positive ions in solution. An acid is the opposite of a base and has a pH of 0 to 7. A given amount of an acid added to the same amount of a base neutralizes the base, producing water and a salt. Common vinegar, for example, is a weak solution of acetic acid.
Other 51Թ Forms
- acidly adverb
- acidness noun
- nonacid noun
- preacid adjective
- preacidness noun
- semiacid adjective
- ˈ adverb
- ˈԱ noun
- ˈ adjective
51Թ History and Origins
51Թ History and Origins
Origin of acid1
Idioms and Phrases
put on the acid, to importune someone, as for money, sexual favors, or confidential information.
Synonym Study
Example Sentences
Other cuts, like “Let Your Body Learn,” became fixtures in acid house and techno DJ sets.
When he did acid, he expanded the whole thing.”
Six people have been charged with murder after a man was killed in an acid attack in his Plymouth home.
They are formed when bacteria break down amino acids containing sulfur.
Piper, who mentors victims of acid attacks through the Katie Piper Foundation, recounted two stories when she had faced discrimination because of the way she looked.
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When To Use
In science, an acid is a sour-tasting substance that releases hydrogen ions when added to water. Acids will turn litmus to a red color and have a pH lower than 7.An acid is any substance that will release hydrogen ions when mixed with water. The amount of hydrogen ions that a substance releases is measured on the pH scale, which ranges from 0 to 14. The lower the pH number is, the more hydrogen ions that are being released. Water has a pH of 7, which is neutral on the pH scale. All acids have a pH lower than 7. A pH greater than 7 indicates an alkali, or base.Acids also have a sour taste, such as the acid found in lemons. A final quality that all acids share is that when they come into contact with litmus paper, they will turn the paper red.Acids are all around us and are used for a wide variety of purposes. Some common acids you can find in your house include lactic acid (in milk), ascorbic acid (in citrus fruits), and acetic acid (in vinegar).
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
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