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Mumetal

[moo-met-l, myoo-]
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noun
  1. an alloy containing nickel, iron, and copper, characterized by high magnetic permeability and low hysteresis losses.

Origin of Mumetal

formerly a trademark; mu (representing the Greek letter, a conventional symbol for permeability) + metal
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018