(organic chemistry) A colourless crystalline compound, 2-hydroxy-1,2,3-propanetricarboxylic acid, C₆H₈O₇, found in citrus fruit; it is used as a food additive and in the manufacture of citrates.

(chemistry) a dicarboxylic acid, HOOC(CH₂)₃COOH, formed during the catabolism of tryptophan

(organic chemistry) The simplest carboxylic acid, HCOOH, a colourless, corrosive liquid with a sharp odour; it is present in the stings of ants, bees and nettles, and is prepared industrially by the oxidation of methanol or formaldehyde; it has some industrial uses, and its esters, the formates are used in perfumes.

(chemistry) a solution of hydrogen iodide, HI, in water; it is a strong acid and reducing agent

(organic chemistry) A colourless liquid, an unsaturated organic acid, used in the manufacture of resins and plastics, with the chemical formula CH₂:C(CH₃)COOH.

(biochemistry, organic chemistry) A polycyclic heterocyclic carboxylic acid, one of the vitamin B complex, essential for cell growth and reproduction

(chemistry) a yellowish hygroscopic solid, H₃PO₃; a mild reducing agent

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

an polyunsaturated fatty acid, having 18 carbon atoms and two double bonds, essential for human nutrition; it is found in linseed, sunflower and other vegetable oils

(organic chemistry) Any organic compound having two carboxylic acid functional groups.