(organic chemistry) A fatty acid, docosanoic acid, having twenty-two carbon atoms.

(organic chemistry) The unsaturated fatty acid cis-docos-11-enoic acid found in many species of fish

(organic chemistry) The polyunsaturated fatty acid all-cis-icosa-5,8,11,14,17-pentaenoic acid found in fish oils

(organic chemistry) the cyclopropene fatty acid 8-(2-octylcyclopropenyl)octanoic acid found in some tropical vegetable oils

(inorganic chemistry) A poisonous, white crystalline compound, H₃AsO₄, formed from arsenic pentoxide and water; it has the same structure as phosphoric acid, and is used in the manufacture of arsenates.

(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.

(inorganic chemistry) the acid formally derived from sulphuric acid by replacing a hydroxyl (-OH) group by an amino (-NH₂) group - SO₂(OH)(NH₂)

(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 saturated fatty acid, CH₃(CH₂)₁₀COOH, occurring in coconut, palm and laurel oil; mostly used in making cosmetics and soaps

(inorganic chemistry) An unstable acid, H₂S₂O₂, only known in solution, used as a reducing agent; its salts are hyposulfites).