(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 auxin plant hormone, synthesized in leaves, that stimulates growth, especially in the presence of ethylene

(chemistry) a weak, unstable acid, HOCl, known only in solution; it is made by the action of chlorine on water and, along with its salts, the hypochlorites, is used as a household bleach

(organic chemistry) A dicarboxylic acid, HOOC-(CHOH)₄-COOH, produced by the oxidation of the milk sugar galactose, used as a test for the presence of galactose and/or lactose.

(organic chemistry) a white crystalline dicarboxylic acid, CH₂(COOH)₂, used in making barbiturates

(chemistry) A pale yellow liquid, H₃PO₂, used as a reducing agent.

(inorganic chemistry) A solution of hydrogen bromide, HBr, in water; it is a strong acid, used in the production of bromine compounds.

(biochemistry) A nonessential amino acid, α-amino-glutaric acid, occurring widely in animal and plant tissues; the salt, monosodium glutamate is used as a flavour-enhancing seasoning.

(music) A style of music from the early rave scene in the UK.

(organic chemistry) An organic compound, 6-methyl-9,10-didehydro-ergoline-8-carboxylic acid, derived from an alkaloid found in ergot; its amide derivatives are widely used as pharmaceuticals and as hallucinogenic drugs (LSD).