(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.

(organic chemistry) An unsaturated organic acid, CH₃-CH=C(CH₃-COOH), found in angelica and having pharmacological uses; the trans- form is tiglic acid.

(organic chemistry) An aromatic heterocyclic organic compound, C₃N₃(OH)₃, that decomposes on heating to form cyanic acid; it is a prebiotic compound found in stellar dust clouds.

(organic chemistry) A white crystalline organic compound, N-cyclohexylsulfamic acid, whose salts, the cyclamates, have been used as artificial sweeteners

(biochemistry) A nonessential amino acid, L-α-amino-succinic acid, aminobutanedioic acid, found in animal protein and in sugar beet etc.