- 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. LSD2.
- 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).
- 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.
- 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.Compare basic(def 3).
- put on the acid, Australian Slang. to importune someone, as for money, sexual favors, or confidential information.
Origin of acid
SynonymsSee more synonyms on Thesaurus.com
Examples from the Web for acid
I write the lyrics and work with Murv Douglas from Lords of Acid.Porn Stars on the Year in Porn: Drone Erotica, Belle Knox, and Wild Sex
December 27, 2014
The recent spate of acid attacks on women is only the latest manifestation of this dangerous trend.The Nuclear Deal That Iran’s Regime Fears Most
November 22, 2014
Your acid experiences also seem to dovetail with expanding your musical consciousness.Herbie Hancock Holds Forth
November 8, 2014
There was no acid in the bucket, just water mixed with some cleansers, which gave the sensation of burning.Acid Attacks on Women Spread Terror in Iran
October 18, 2014
Twice in our conversations, which spanned two days this past week, the actors started joking about tripping on acid.How Bill Hader and Kristen Wiig Pulled Off Their Most Dramatic Roles Yet
September 12, 2014
It is produced by the action of zinc-dust on the acid sulphite of soda.
Of acid it would take 60 times the weight of the gas, or nearly 76 tons.Flying Machines
W.J. Jackman and Thos. H. Russell
"Very nice," said Cleopatra, trying with all her over-amuleted heart, not to be acid.It Happened in Egypt
C. N. Williamson
The lead salts not soluble in ether were decomposed by acid.
Father was workin' on the acid, that's 'ow he got 'is pisoned-leg.Strife (First Series Plays)
- of, derived from, or containing acidan acid radical
- being or having the properties of an acidsodium 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 materialacid steel
Word Origin and History for acid
1620s, "of the taste of vinegar," from French acide (16c.) or directly from Latin acidus "sour, sharp," adjective of state from acere "to be sour," from PIE root *ak- "sharp, pointed" (see acrid). Figurative use from 1775; applied to intense colors from 1916. Acid test is American English, 1892, from the frontier days, when gold was distinguished from similar metals by application of nitric acid. Acid rain is first recorded 1859 in reference to England.
When I was on acid I would see things that looked like beams of light, and I would hear things that sounded an awful lot like car horns. [Mitch Hedberg, 1968-2005, U.S. stand-up comic]
Acid rock (type played by or listen to by people using LSD) is also from 1966; acid house dance music style is 1988, probably from acid in the hallucinogenic sense + house "dance club DJ music style."
- Any of a large class of sour-tasting substances whose aqueous solutions are capable of turning blue litmus indicators red, of reacting with and dissolving certain metals to form salts, and of reacting with bases or alkalis to form salts.
- A substance that ionizes in solution to give the positive ion of the solvent.
- A substance capable of yielding hydrogen ions.
- A proton donor.
- An electron acceptor.
- A molecule or ion that can combine with another by forming a covalent bond with two electrons of the other.
- A substance having a sour taste.
- Of or relating to an acid.
- Having a high concentration of acid.
- Having a sour taste.
- 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.
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.