An organic acid containing one or more carboxyl groups. Carboxylic acids often have names ending in -oic acid, such as benzoic acid. Amino acids, fatty acids, and many other important organic compounds are carboxylic acids.
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Carboxyl: The carboxyl group is an organic functional group consisting of a carbon atom double bonded to an oxygen atom and single bonded to a hydroxyl group.
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Member of a class of organic chemical compounds containing the group COOH. The commonest example is ethanoic acid (acetic acid, CH3COOH), which is present in vinegar. These acids are weakly acidic, forming salts with bases and esters with alcohols. Esters of high-molecular weight, carboxylic acids, such as stearic, lauric and oleic acids, are present in animal and vegetable fats; for this reason carboxylic acids are often called fatty acids.
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