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Meaning of ferric oxide

fer'ric ox'ide

Pronunciation: [key]
— Chem. Chem.
  1. a dark-red, crystalline, water-insoluble solid, FeO, occurring naturally, as hematite and rust, or synthesized: used chiefly as a pigment, as a mordant, as a coating for magnetic recording tape, and in the manufacture of polishing compounds. Also called
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.