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Mumetal

[ moo-met-l, myoo- ]
/ ˈmuˌmɛt l, ˈmyu- /
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noun
an alloy containing nickel, iron, and copper, characterized by high magnetic permeability and low hysteresis losses.
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Which of the following nouns has an irregular plural form?

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. 2022
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