pyrophoric solid. Catches fire spontaneously when exposed to air at normal room temperature. For example, powdered potassium metal is pyrophoric.
• (a.) Alt. of Pyrophorous
pyrophoric 1. Bursting into flames spontaneously when exposed to air. 2. Producing sparks when struck: giving off sparks when struck or scraped. 3. From pyrophorus, a substance that ignites spontaneously
capable of igniting spontaneously in air.