| cyanic acid | (n) a colorless poisonous volatile liquid acid that hydrolyzes readily to ammonia and carbon dioxide |
| ferricyanic acid | (n) a brown unstable acid formed from ferricyanide |
| ferrocyanic acid | (n) a white unstable acid formed from ferrocyanide salts |
| hydrocyanic acid | (n) a solution of hydrogen cyanide in water; weak solutions are used in fumigating and in the synthesis of organic compounds, Syn. prussic acid |
| isocyanic acid | (n) an acid known only in the form of its esters |
| thiocyanic acid | (n) an unstable acid that can be obtained by distilling a thiocyanate salt |