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ferrite

noun

  1. one of the forms of pure metallic iron, having high magnetic permeability and occurring as a constituent of ordinary iron and steel
  2. any of various ceramic, magnetic materials with poor electrical conductivity, containing ferric oxide and another metallic oxide: used in recording tape and computer memories
  3. Geol. a grain, scale, or bit of red, brown, or yellow iron oxide in a rock

See ferrite in American Heritage Dictionary 4

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