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acid US English

A chemical substance that neutralizes alkalis, dissolves some metals, and turns litmus red; typically, a corrosive or sour-tasting liquid of this kind

acid US Thesaurus

a slightly acid flavor

acid drop US English

A kind of boiled sweet with a sharp taste

acid-fast US English

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

acid jazz US English

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

acid rain US English

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

acid rock US English

A type of rock music, mainly of the late 1960s, associated with or inspired by the use of hallucinogenic drugs

acid salt US English

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

acid test US English

A conclusive test of the success or value of something

keto acid US English

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

lead-acid US English

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

uric acid US English

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

acetic acid US English

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

acid house US 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 US English

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

adipic acid US English

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

amino acid US English

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

boric acid US 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 US English

A strongly oxidizing acid known only in aqueous solutions

cholic acid US English

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

citric acid US 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 flavoring and setting agent

cyanic acid US English

A colorless, poisonous, volatile, strongly acidic liquid

erucic acid US English

A solid compound present in mustard and rape seeds

fatty acid US 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 US English

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

formic acid US English

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

fruit acid US English

Another term for alpha-hydroxy acid

fulvic acid US English

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

gallic acid US English

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

iodic acid US English

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

kainic acid US English

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

lactic acid US English

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

Lewis acid US English

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

maleic acid US English

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

malic acid US English

A crystalline acid present in unripe apples and other fruits

nitric acid US English

A colorless or pale yellow liquid acid that is corrosive and poisonous and has strong oxidizing properties, made in the laboratory by distilling nitrates with sulfuric acid

oleic acid US English

An unsaturated fatty acid present in many fats and soaps

osmic acid US English

A solution of osmium tetroxide

oxalic acid US English

A poisonous crystalline acid with a sour taste, present in rhubarb leaves, wood sorrel, and other plants. Its uses include bleaching and cleansing

picric acid US English

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

quinic acid US English

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

sialic acid US English

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

tannic acid US English

Another term for tannin.

uronic acid US English

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

usnic acid US English

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

abscisic acid US English

A plant hormone that promotes leaf detachment, induces seed and bud dormancy, and inhibits germination

acid radical US English

A radical formed by the removal of hydrogen ions from an acid

acrylic acid US English

A pungent liquid organic acid that can be polymerized to make synthetic resins

adenylic acid US English

Another term for adenosine monophosphate.

alginic acid US English

An insoluble gelatinous carbohydrate found (chiefly as salts) in many brown seaweeds. The sodium salt is used as a thickener in foods and many other materials

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