isocyanic

from The Century Dictionary.

• Noting an acid, a very volatile liquid, HNCO, formed by heating cyanuric acid, or by the action of phosphoric anhydrid on carbamide (urea).

from the GNU version of the Collaborative International Dictionary of English.

• adjective (Chem.) Designating an acid isomeric with cyanic acid.
• adjective 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.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective chemistry Of or pertaining to isocyanic acid, and to its salts (the isocyanates)