Pyro["u]ric

from The Collaborative International Dictionary of English v.0.48

Pyrouric \Pyr`o*["u]"ric\, a. [Pyro- + uric.] (Old Chem.)
   Pertaining to, or designating, an acid now called {cyanuric}
   acid. See {Cyanuric}.
   [1913 Webster]