Entry 1 sense Webster, 1913 Pyroüric · Pyr·o·ü·ric · IPA 01 a. Pertaining to, or designating, an acid now called cyanuric acid. See Cyanuric. 1. Pertaining to, or designating, an acid now called cyanuric acid. See Cyanuric.(Old Chem.) Also: cyanuric See: Cyanuric