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Permalloy

[purm-al-oi, pur-muh-loi]
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Trademark.
  1. a brand name for any of a class of alloys of high magnetic permeability, containing from 30 to 90 percent nickel.
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Origin of Permalloy

First recorded in 1920–25; perm(anent) + alloy
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for permalloy

permalloy

noun
  1. any of various alloys containing iron and nickel (45–80 per cent) and sometimes smaller amounts of chromium and molybdenum
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Word Origin

C20: from perm (eability) + alloy
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012