isocyanic acid

from WordNet (r) 3.0 (2006)

isocyanic acid
    n 1: an acid known only in the form of its esters

from The Collaborative International Dictionary of English v.0.48

Isocyanic \I`so*cy*an"ic\, a. [Iso- + cyanic.] (Chem.)
   Designating an acid isomeric with cyanic acid.
   [1913 Webster]

   {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}.
      [1913 Webster]