(organic chemistry) An unsaturated organic acid, trans-CH₃-CH=CH-COOH, found in croton oil and having many industrial uses; the cis- form is isocrotonic acid.

(organic chemistry) An unsaturated fatty acid, having 18 carbon atoms and one double bond, found in olive oil and very many other vegetable and animal oils and fats; it is used for making soap, cosmetics etc.

(biochemistry) one of the constituents of the citric acid cycle, formed by the oxidation of malic acid and via the transamination of aspartic acid; an intermediate in the synthesis of amino acids and the metabolism of carbohydrates

(chemistry) a carboxylic acid derived from galactose by oxidation of the terminal CH₂OH to a COOH; it polymerizes to form pectic acid

(chemistry) the acid, HMnO₄, known only as its salts, the permanganates

an acidic derivative of a carbohydrate; the active constituent of pectin / (chemistry) a helical polymer of αD-galacturonic acid

(organic chemistry) an aliphatic carboxylic acid, CH₃(CH₂)₇COOH, nonanoic acid, used in the manufacture of plastics, pharmaceuticals etc

(organic chemistry) One of the most common saturated fatty acids; it is found in all animal and most vegetable oils and fats; it is used in the manufacture of soap etc.

(organic chemistry) octadecanoic acid; the most common saturated fatty acid; it is found in all animal and most vegetable oils and fats; it is used in the manufacture of soap etc.

(chemistry) 2,4,6-trinitrophenol, C₆H₂(NO₂)₃, prepared by the nitration of phenol or of aspirin; a toxic, yellow, explosive substance used in dyes, explosives, and as an antiseptic