Pȳ-rŏph'o-rŭs, n.

(pī-rŏf'o-rus), n. [N. Lat. pyrophorus, Fr. pyrophore. See supra.] (Chem.) A substance which takes fire on exposure to air, or which maintains or retains light. It is best made by heating together alum, pearl-ashes, and lamp-black. Silliman.