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acid British & World English

A substance with particular chemical properties including turning litmus red, neutralizing alkalis, and dissolving some metals; typically, a corrosive or sour-tasting liquid of this kind

acid English Thesaurus

a very juicy fruit with a slightly acid flavour

acid New Oxford Dictionary for Writers & Editors

substance that turns litmus red, neutralizes alkalis, etc.

acid drop British & World English

A kind of boiled sweet with a sharp taste

acid-fast British & World English

Denoting bacteria that cannot be decolorized by an acid after staining, which is characteristic of the mycobacteria that cause tuberculosis and leprosy

acid head British & World English

A habitual user of the drug LSD

acid jazz British & World English

A kind of popular dance music incorporating elements of jazz, funk, soul, and hip hop

acid rain British & World English

Rainfall made so acidic by atmospheric pollution that it causes environmental harm, chiefly to forests and lakes. The main cause is the industrial burning of coal and other fossil fuels, the waste gases from which contain sulphur and nitrogen oxides which combine with atmospheric water to form acids

acid rock British & World English

A style of rock music popular chiefly in the late 1960s, associated with or inspired by hallucinogenic drugs

acid salt British & World English

A salt formed by incomplete replacement of the hydrogen of an acid, e.g. potassium hydrogen sulphate (KHSO4)

acid test British & World English

A conclusive test of the success or value of something

keto acid British & World English

A compound whose molecule contains both a carboxyl group (—COOH) and a ketone group (—CO—)

lead-acid British & World English

Denoting a secondary cell or battery in which the electrodes are plates or grids of lead (or lead alloy) immersed in dilute sulphuric acid. The anode is coated with lead dioxide and the cathode with spongy lead

uric acid British & World English

An almost insoluble compound which is a breakdown product of nitrogenous metabolism. It is the main excretory product in birds, reptiles, and insects

acetic acid British & World English

The acid that gives vinegar its characteristic taste. The pure acid is a colourless viscous liquid or glassy solid

acid house British & World English

A kind of popular synthesized dance music with a fast repetitive beat, popular in the 1980s and associated with the taking of drugs such as Ecstasy

acid reflux British & World English

A condition in which acidic gastric fluid is regurgitated into the esophagus, causing heartburn

adipic acid British & World English

A crystalline fatty acid obtained from natural fats and used especially in the manufacture of nylon

amino acid British & World English

A simple organic compound containing both a carboxyl (—COOH) and an amino (—NH2) group

boric acid British & World English

A weakly acid crystalline compound derived from borax, used as a mild antiseptic and in the manufacture of heat-resistant glass and enamels

bromic acid British & World English

A strongly oxidizing acid known only in aqueous solutions

cholic acid British & World English

A compound produced by oxidation of cholesterol. It is a steroidal fatty acid and its salts are present in bile

citric acid British & World English

A sharp-tasting crystalline acid present in the juice of lemons and other sour fruits. It is made commercially by the fermentation of sugar and used as a flavouring and setting agent

cyanic acid British & World English

A colourless, poisonous, volatile, strongly acidic liquid

erucic acid British & World English

A solid compound present in mustard and rape seeds

fatty acid British & World English

A carboxylic acid consisting of a hydrocarbon chain and a terminal carboxyl group, especially any of those occurring as esters in fats and oils

folic acid British & World English

A vitamin of the B complex found especially in leafy green vegetables, liver, and kidney

formic acid British & World English

A colourless irritant volatile acid made catalytically from carbon monoxide and steam. It is present in the fluid emitted by some ants

fruit acid British & World English

Another term for alpha-hydroxy acid.

fulvic acid British & World English

A highly soluble organic phenol found in humus that chelates elemental mineral nutrients

gallic acid British & World English

An acid extracted from oak galls and other vegetable products, formerly used in making ink

iodic acid British & World English

A crystalline acid with strong oxidizing properties, made by oxidation of iodine

kainic acid British & World English

An organic acid extracted from a red alga, used to kill intestinal worms

lactic acid British & World English

A colourless syrupy organic acid formed in sour milk, and produced in the muscle tissues during strenuous exercise

Lewis acid British & World English

A compound or ionic species which can accept an electron pair from a donor compound

maleic acid British & World English

A crystalline acid made by distilling malic acid, used in making synthetic resins

malic acid British & World English

A crystalline acid present in unripe apples and other fruits

nitric acid British & World English

A colourless or pale yellow corrosive poisonous liquid acid with strong oxidizing properties, made in the laboratory by distilling nitrates with sulphuric acid

oleic acid British & World English

An unsaturated fatty acid present in many fats and soaps

osmic acid British & World English

A solution of osmium tetroxide

oxalic acid British & World English

A poisonous crystalline acid with a sour taste, present in rhubarb leaves, wood sorrel, and other plants

picric acid British & World English

A bitter yellow compound obtained by nitrating phenol, used as a dye and in the manufacture of explosives

quinic acid British & World English

An acid present in cinchona bark and other plant products, used in the synthesis of pharmaceuticals

sialic acid British & World English

A substance present in saliva which consists of acyl derivatives of neuraminic acid

tannic acid British & World English

Another term for tannin.

uronic acid British & World English

Any of a class of compounds which are derived from sugars by oxidizing a —CH2OH group to an acid group (—COOH)

usnic acid British & World English

A yellow crystalline compound which is present in many lichens and is used as an antibiotic


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