pyritic

Etymology tree
Proto-Indo-European *péh₂wr̥
Proto-Hellenic *pāwər
Ancient Greek πῦρ (pûr)
Proto-Indo-European *-tósder.
Ancient Greek -της (-tēs)der.
Ancient Greek -ῑ́της (-ī́tēs)
Ancient Greek πῠρῑ́της (pŭrī́tēs)bor.
Latin pȳritēsder.
Old French pyriteder.
English pyrite
Proto-Indo-European *-ikos
Proto-Italic *-ikos
Latin -icuslbor.
Old French -iquebor.
Middle English -ik
English -ic
English pyritic
From pyrite + -ic.