Forming adjectives with the senses ‘of or relating to pyrites or pyrite’, ‘pyrites and ——’, as †pyrito-bituminous, etc.
ΚΠ
1796 R. KirwanElements Mineral. (ed. 2) II. 17 The Ores in which Allum owes its origin to the decomposition of Pyrites... 1st. The purely pyritous... 2d. The Pyrito Bituminous.