(organic chemistry) A colourless crystalline dicarboxylic acid, (CH₂COOH)₂, that occurs naturally in amber and is important in the metabolic Krebs cycle.

(organic chemistry) A fatty acid, CH₃(CH₂)₈COOH, obtained from animal fats, and used in the manufacture of perfumes and flavours.

(biochemistry) A white crystalline organic compound, C₆H₈O₆, found in citrus fruits and many vegetables; it is an antioxidant and an efficient scavenger of free radicals.

(organic chemistry) A liquid fatty acid, CH₃(CH₂)₄COOH, obtained from animal fats, and used in the manufacture of pharmaceuticals and flavours.

(chemistry) H₃BO₃; B(OH)₃; a white crystalline solid, soluble in hot water to form a weak acid. Used as a mild antiseptic, flame retardant, insecticide, and in the manufacture of borax and other borate salts.

(organic chemistry) Either of the two isomeric carboxylic acids, normal butyric acid and isobutyric acid, with the chemical formula C₃H₇COOH, occurring in animal milk fat.

(organic chemistry) A colourless liquid unsaturated organic acid, CH₂=CHCOOH; used as a monomer in the production of acrylic resins; forms acrylate esters by combination with alcohols.

(inorganic chemistry) A relatively unstable form of chromic acid, H₂Cr₂O₇, known only in solution or as its salts, the dichromates, from which it may be prepared.

(inorganic chemistry) A corrosive acid, H₂CrO₄, known only in solution or as its salts, the chromates (from which it may be prepared); it is a very powerful oxidizing agent.

(chemistry) Any compound, of general formula HXⁿ⁺, which can be transformed into a conjugate base X⁽ⁿ⁻¹⁾⁺ by the loss of a proton.