(organic chemistry) 2-phenyl-2-hydroxyacetic acid, C₆H₅CH(OH)COOH; originally extracted from bitter almonds, it has antibacterial and bacteriostatic properties.

(biochemistry) A terpenoid best known as a plant hormone that inhibits seed germination and was once thought to be important in abscission.

(inorganic chemistry, chiefly Britain) Alternative spelling of thiosulfuric acid

(British spelling, chemistry) Alternative spelling of sulfonic acid

(inorganic chemistry, chiefly British spelling) Alternative spelling of sulfurous acid

(chemistry) The acid H₂VO₃, known only in solution

(chemistry) Any polymer of acrylic acid

(chemistry) Any polyunsaturated fatty acid

(chemistry, dated) The poisonous glucoside saponin.

(organic chemistry, pharmacology) An organic unsaturated fatty acid derived from natural castor oil (ricinoleic acid). It has fungicidal properties and is used in the treatment of skin disorders, nail fungus etc.