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.

Source: Webster's Revised Unabridged Dictionary (1913)