| acid | | |
| n. (substance) | 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). |
| ~ cyanic acid | a colorless poisonous volatile liquid acid that hydrolyzes readily to ammonia and carbon dioxide. |
| ~ cyanuric acid | a trimer of cyanic acid. |
| ~ ferricyanic acid | a brown unstable acid formed from ferricyanide. |
| ~ ferrocyanic acid | a white unstable acid formed from ferrocyanide salts. |
| ~ fluoroboric acid | an acid of fluorine and boron. |
| ~ fluosilicic acid, hydrofluosilicic acid | an unstable poisonous corrosive acid known primarily in the form of its salts. |
| ~ formic acid | a colorless pungent fuming vesicatory liquid acid HCOOH found naturally in ants and many plants or made catalytically from carbon monoxide and steam; used in finishing textiles and paper and in the manufacture of insecticides and fumigants. |
| ~ fumaric acid | a colorless crystalline acid with a fruity taste; used in making polyester resins. |
| ~ gallic acid | a colorless crystalline acid obtained from tannin. |
| ~ glyceric acid | a syrupy acid obtained by oxidation of glycerol or glyceraldehyde. |
| ~ glycolic acid, glycollic acid, hydroxyacetic acid | a translucent crystalline compound found in sugar cane and sugar beets and unripe grapes. |
| ~ hydrobromic acid | an aqueous solution of hydrogen bromide that is a strong liquid acid. |
| ~ chlorohydric acid, hydrochloric acid | an aqueous solution of hydrogen chloride; a strongly corrosive acid. |
| ~ hydrogen chloride | a colorless corrosive gas (HCl). |
| ~ hydrofluoric acid | a weak poisonous liquid acid; formed by solution of hydrogen fluoride in water. |
| ~ hydroiodic acid | an acid formed by aqueous solution of hydrogen iodide. |
| ~ hypochlorous acid | a weak unstable acid known only in solution and in its salts; used as a bleaching agent and as an oxidizing agent. |
| ~ iodic acid | a soluble crystalline acid; used as a reagent and disinfectant. |
| ~ isocyanic acid | an acid known only in the form of its esters. |
| ~ itaconic acid | a crystalline carboxylic acid; occurs in some fermentations of sugars. |
| ~ maleic acid | a colorless crystalline compound found in unripe fruit (such as apples or tomatoes or cherries) and used mainly to make polyester resins. |
| ~ oxalacetic acid, oxaloacetic acid | an acid formed by oxidation of maleic acid (as in metabolism of fats and carbohydrates). |
| ~ ethanedioic acid, oxalic acid | a toxic colorless crystalline organic acid found in oxalis and other plants; used as a bleach and rust remover and in chemical analysis. |
| ~ oxyacid, oxygen acid | any acid that contains oxygen. |
| ~ pantothen, pantothenic acid | a vitamin of the vitamin B complex that performs an important role in the oxidation of fats and carbohydrates and certain amino acids; occurs in many foods. |
| ~ paba, para aminobenzoic acid | a metabolic acid found in yeast and liver cells; used to make dyes and drugs and sun blockers. |
| ~ pectic acid | a complex acid that occurs in ripe fruit and some vegetables. |
| ~ permanganic acid | an unstable purple acid (HMnO4) known only in solution or of permanganate salts. |
| ~ phthalic acid | a colorless acid used to make dyes and perfumes. |
| ~ picric acid | a yellow toxic highly explosive strong acid; used in high explosives and as a dye and in chemical reactions. |
| ~ pyruvic acid | a colorless acid formed as an important intermediate in metabolism or fermentation. |
| ~ dichromic acid | the hypothetical acid (H2Cr2O7) from which dichromates are derived; known only in solution and in the form of dichromate salts. |
| ~ silicic acid | a jellylike substance (hydrated silica). |
| ~ sulfanilic acid, sulphanilic acid | a crystalline acid made from aniline and used as a dye. |
| ~ thiocyanic acid | an unstable acid that can be obtained by distilling a thiocyanate salt. |
| ~ toluic acid | an isomeric acid derived from toluene. |
| ~ triphosphoric acid | an acid that is a partial anhydride of three molecules of phosphoric acid; known chiefly in the form of its salts and esters. |
| ~ undecylenic acid | an acid that is a component of perspiration. |
| ~ uric acid | a white tasteless odorless crystalline product of protein metabolism; found in the blood and urine. |
| ~ oil of vitriol, sulfuric acid, sulphuric acid, vitriol | (H2SO4) a highly corrosive acid made from sulfur dioxide; widely used in the chemical industry. |
| ~ xanthic acid | any of a class of unstable organic acids containing sulphur. |
| n. (artifact) | 2. acid, back breaker, battery-acid, dose, dot, elvis, loony toons, lucy in the sky with diamonds, pane, superman, window pane, zen | street name for lysergic acid diethylamide. |
| ~ lsd, lysergic acid diethylamide | a powerful hallucinogenic drug manufactured from lysergic acid. |
| adj. | 3. acerb, acerbic, acid, acrid, bitter, blistering, caustic, sulfurous, sulphurous, virulent, vitriolic | 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" |
| ~ unpleasant | disagreeable to the senses, to the mind, or feelings.; "an unpleasant personality"; "unpleasant repercussions"; "unpleasant odors" |
| adj. | 4. acid, acidic, acidulent, acidulous | being sour to the taste. |
| ~ sour | having a sharp biting taste. |
| adj. | 5. 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). |
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