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

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

A clear colourless liquid; a strong acid and a violent, sometimes explosive, oxidizing agent / (chemistry) HClO₄, the oxyacid of chlorine in which chlorine has the highest oxidation number

(organic chemistry) A colourless, crystalline dicarboxylic acid, (COOH)₂, found in rhubarb, spinach and other plants, often as crystals of the calcium salt.

(chemistry) an alternative name for hyposulfurous acid

(chemistry) Alternative spelling of hyposulfurous acid

(inorganic chemistry) An unstable acid, H₂S₂O₃, formally derived from sulfuric acid by the substitution of a sulfur atom in the place of an oxygen one; it is known only in solution or as its salts and esters, the thiosulfates.

(organic chemistry) an unsaturated organic dicarboxylic acid, HOOCCH=CHCOOH, the geometric isomer of fumaric acid; it is found in unripe fruit, and is used industrially in the production of polyester resins