acid

ac·id (

1. Chemistry

a. 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.

b. A substance that yields hydrogen ions when dissolved in water.

c. A substance that can act as a proton donor.

d. A substance that can accept a pair of electrons to form a covalent bond.

2. A substance having a sour taste.

3. The quality of being sarcastic, bitter, or scornful: wrote with acid about her first marriage.

4. Slang See LSD¹.

adj.

1. Chemistry

a. Of, relating to, or containing an acid.

b. Having a high concentration of acid.

c. Having the characteristics of an acid.

a. Having a pH of less than 7.

b. Having a relatively high concentration of hydrogen ions.

3. Geology Containing a large proportion of silica: acid rocks.

4. Having a sour taste. See Synonyms at sour.

5. Biting, sarcastic, or scornful: an acid wit; an acid tone of voice.

[From Latin acidus, sour, from acre, to be sour; see ak- in Indo-European roots.]

acid·ly adv.

acid·ness n.

acid

Noun

1. Chem one of a class of compounds, corrosive and sour when dissolved in water, that combine with a base to form a salt

2. Slang LSD

3. a sour-tasting substance

Adjective

1. Chem of, from, or containing acid

2. sharp or sour in taste

3. sharp in speech or manner [Latin acidus]

acidly adv

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.

acidic adjective

ThesaurusLegend: Synonyms Related Words Antonyms

Noun	1.	acid - 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 alcapton, alkapton, homogentisic acid - an acid formed as an intermediate product of the metabolism of tyrosine and phenylalanine arsenic acid - an acid formed from arsenic pentoxide cerotic acid, hexacosanoic acid - a white solid fatty acid found in waxes (such as beeswax) chloric acid - (HClO3) a strong unstable acid with an acrid odor found in chlorate salts chlorous acid - (HClO2) a strongly oxidizing acid; known only in solution monobasic acid - an acid containing only one replaceable hydrogen atom per molecule dibasic acid - an acid containing two replaceable hydrogen atoms per molecule tribasic acid - an acid containing three replaceable hydrogen atoms per molecule tetrabasic acid - an acid containing four replaceable hydrogen atoms per molecule fulminic acid - (CNOH) an unstable acid occurring mainly in the form of explosive salts and esters that is isomeric with cyanic acid gamma acid - a crystalline acid used to make azo dyes hydriodic acid - (HI) a colorless or yellow aqueous solution of hydrogen iodide; "hydriodic acid is a strong acid" hydrocyanic acid, prussic acid - a solution of hydrogen cyanide in water; weak solutions are used in fumigating and in the synthesis of organic compounds hydroxy acid - any acid that has hydroxyl groups in addition to the hydroxyl group in the acid itself hyponitrous acid - an explosive white crystalline weak acid (H2N2O2) lysergic acid - a crystalline acid often used in medical research; obtained from ergotic alkaloids manganic acid - a dibasic acid (H2MnO4) found only in solution and in manganate salts 2-methylpropenoic acid, methacrylic acid - an unsaturated acid (C4H6O2) used to make resins and plastics selenic acid - a strong acid (H2SeO4) analogous to sulfuric acid sulfonic acid, sulphonic acid - an acid derived from sulphuric acid titanic acid - a white weak acid that is a hydrated form of titanium dioxide perchloric acid - a powerful oxidizing agent; forms perchlorates carboxylic acid - an organic acid characterized by one or more carboxyl groups aminobenzoic acid - a derivative of benzoic acid aqua fortis, nitric acid - acid used especially in the production of fertilizers and explosives and rocket fuels nitrous acid - an unstable inorganic acid known only in solution and as nitrite salts aqua regia, nitrohydrochloric acid - a yellow fuming corrosive mixture of nitric and hydrochloric acid that dissolves metals (including gold) barbituric acid, malonylurea - a white crystalline acid derived from pyrimidine; used in preparing barbiturate drugs lansoprazole, Prevacid - antacid (trade name Prevacid) that suppresses acid secretion in the stomach boracic acid, boric acid - any of various acids containing boron and oxygen boric acid, orthoboric acid - a white or colorless slightly acid solid that is soluble in water and ethanol; used in the manufacture of glass and paper and adhesives and in detergents and as a flux in welding; also used as an antiseptic and food preservative bromic acid - an unstable acid used as an oxidizing agent carbamic acid - an acid that is known only by virtue of its salts (as ammonium carbamate) or its esters (as urethane) carbolic acid, hydroxybenzene, oxybenzene, phenylic acid, phenol - a toxic white soluble crystalline acidic derivative of benzene; used in manufacturing and as a disinfectant and antiseptic; poisonous if taken internally carbonic acid - a weak acid known only in solution; formed when carbon dioxide combines with water chromic acid - an unstable acid known only in solution and as chromate salts citric acid - a weak water-soluble acid found in many fruits (especially citrus fruits); used as a flavoring agent chemical compound, compound - (chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight cyanamid, cyanamide - a weak soluble dibasic acid (the parent acid of cyanamide salts)
	2.	acid - street name for lysergic acid diethylamide back breaker, battery-acid, Elvis, loony toons, Lucy in the sky with diamonds, window pane, superman, Zen, pane, dose, dot LSD, lysergic acid diethylamide - a powerful hallucinogenic drug manufactured from lysergic acid
Adj.	1.	acid - harsh or corrosive in tone; "an acerbic tone piercing otherwise flowery prose"; "a barrage of acid comments"; "her acrid remarks make her many enemies"; "bitter words"; "blistering criticism"; "caustic jokes about political assassination, talk-show hosts and medical ethics"; "a sulfurous denunciation"; "a vitriolic critique" blistering, caustic, vitriolic, sulfurous, sulphurous, acerb, acerbic, acrid, bitter, virulent unpleasant - disagreeable to the senses, to the mind, or feelings ; "an unpleasant personality"; "unpleasant repercussions"; "unpleasant odors"
	2.	acid - being sour to the taste acidulent, acidulous, acidic sour - having a sharp biting taste
	3.	acid - having the characteristics of an acid; "an acid reaction" chemical science, chemistry - the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions acidic - being or containing an acid; of a solution having an excess of hydrogen atoms (having a pH of less than 7)