
• (a.) Designating an acid isomeric with cyanic acid.
Found on 
http://thinkexist.com/dictionary/meaning/isocyanic/
 I`so·cy·an'ic  adjective
I`so·cy·an'ic  adjective [ 
 Iso- + 
 cyanic .] 
 (Chemistry) 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 ac...
Found on http://www.encyclo.co.uk/webster/I/102
  No exact match found.