PYROPHORIC; PYROPHOROUS
Pyr`o*phor"ic, Py*roph"o*rous, a. Etym: [Pyro- + Gr.
Defn: Light-producing; of or pertaining to pyrophorus. Pyrophoric iron (Chem.), finely reduced iron, which ignites spontaneously on contact with air.
PYROPHORUS
Py*roph"o*rus, n. Etym: [NL. See Pyrophorous.] (Old Chem.)
Defn: Any one of several substances or mixtures which phosphoresce or ignite spontaneously on exposure to air, as a heated mixture of alum, potash, and charcoal, or a mixture of charcoal and finely divided lead.
PYROPHOSPHATE
Pyr"o*phos"phate, n. (Chem.)
Defn: A salt of pyrophosphoric acid.
PYROPHOSPHORIC
Pyr`o*phos*phor"ic, a. Etym: [Pyro- + phosphoric.] (Chem.)
Defn: Pertaining to, or designating, an acid, H4P2O7, which is obtained as a white crystalline substance. Its salts are obtained by heating the phosphates.
PYROPHYLLITE
Py*roph"yl*lite, n. Etym: [Pyro- + Gr. (Min.)
Defn: A mineral, usually of a white or greenish color and pearly luster, consisting chiefly of the hydrous silicate of alumina.