pyritiferous,a.|paɪər-, pɪrɪˈtɪfərəs| [f. pyrites + -ferous.] Yielding pyrites. 1828–32in Webster.1847–8H. Miller First Impr. xii. (1857) 188 Here it trickles..through a pyritiferous shale.1877Raymond Statist. Mines & Mining 391 All the siliceous pyritiferous ores are selected for this purpose.