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]

The Collaborative International Dictionary of English v.0.48:

Cyanuric \Cy`a*nu"ric\ (s?`?-n?"r?k), a. [Cyanic + uric: Cf. F.
   cyanurique.] (Chem.)
   Pertaining to, or derived from, cyanic and uric acids.
   [1913 Webster]