Home › Words › P › pyrophoruspyrophoruspyrophorus means a substance capable of catching fire spontaneously on exposure to the air, especially in a finely divided state.EtymologyAncient Greek πῦρ (pûr, “fire”) + φέρω (phérō, “to bear”). Analyzable as pyro- + -phorusnouna substance capable of catching fire spontaneously on exposure to the air, especially in a finely divided stateDefinitions & examples from Wiktionary (CC BY-SA 3.0).