1.Chemistry. Of cyanogen, containing cyanogen in composition. cyanic acid, a colourless, pungent, volatile, unstable liquid (CNHO). cyanic ethers, the cyanates of the alcohol radicals.
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1832 R. ChristisonTreat. Poisons (ed. 2) xxviii. 663Cyanic and Cyanous acids are not poisonous.
1866 H. E. RoscoeLessons Elem. Chem. xxxv. 312Cyanic acid itself cannot be prepared in the free state from its salts.