1. A burning up; conflagration. "Innumerable deluges and deflagrations." Bp. Pearson. 2. (Chem.) The act or process of deflagrating.
An important ore of iron, the sesquioxide, so called
because of the red color of the powder. It occurs in splendent
rhombohedral crystals, and in massive and earthy forms; -- the last
called red ocher. Called also specular iron, oligist iron...