ferrite

noun

Etymology: From New Latin, from Latin ferrum (“iron”) + -ite.

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

   “ferrite transition zone”

   “Technical terms like ferrite, perlite, graphite, and hardenite were bandied to and fro, and when Paget glibly brought out such a rare exotic as ferro-molybdenum, Benson forgot that he was a master ship-builder, […]”

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

   “ferrite magnets”

   “The actual hardware is obsolete; for example, the memories are of the old ferrite core type.”

3. The anion FeO₂²⁻, and any of the salts (formally derived from the unknown ferrous acid) derived from it.

   “sodium ferrite”

   “calcium ferrite”