Any
compound that can be regarded as being
formed from
ferric oxide and a basic oxide or from ferric
hydroxide and a
base; esp. any of the compounds with the
formula MFe2O4 (where M is a
bivalent
metal ion or a
stoicheiometrically equivalent mixture of such ions), many of which have
magnetic properties and a low
electrical conductivity that make them suitable for use in high-frequency electrical
components.
--
OED2