What is the meaning of Ferrite?

The interstitial solid solution of carbon in body-centered cubic iron.

Any of a class of metal oxides which show ferrimagnetism; used in transformers, inductors, antennas, recording heads, microwave devices, motors and loudspeakers.

The anion FeO2, and any of the salts (formally derived from the unknown ferrous acid) derived from it.

ferrite

ferrite (class of iron oxides)

Source: wiktionary.org