pyrophorus / a firefly of the genus Pyrophorus

plural of pyrophore

Spontaneously igniting in air, especially when in a finely divided state. / Producing sparks, especially by friction.

The state of being pyrophoric.

(archaic) light-producing / (archaic) of or relating to pyrophorus

An alloy, especially one of iron or cerium, that emits sparks when scratched or struck.

finely powdered iron, which ignites spontaneously in air

plural of pyrophoric alloy