The Collaborative International Dictionary
Pyrophoric iron
Pyrophoric \Pyr`o*phor"ic\, Pyrophorous \Py*roph"o*rous\, a. Light-producing; of or pertaining to pyrophorus.
Pyrophoric iron (Chem.), finely reduced iron, which ignites spontaneously on contact with air.
Wiktionary
pyrophoric iron
n. finely powdered iron, which ignites spontaneously in air
Usage examples of "pyrophoric iron".
As the iridescent silver whirlwind touched the surface of the Release Flame tiny glowing sparks picked out the edge, like the display of pyrophoric iron dropped from a tube.