Isocyanic \I`so*cy*an"ic\, a. [Iso- + cyanic.] (Chem.) Designating an acid isomeric with cyanic acid. {Isocyanic acid}, an acid metameric with cyanic acid, and resembling it in its salts. It is obtained as a colorless, mobile, unstable liquid by the heating cyanuric acid. Called technically {carbimide}.