Perm alloy


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

1920–25; perm(anent) + alloy Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
permalloy (pɜːmˈælɔɪ)
any of various alloys containing iron and nickel (45--80 per cent) and sometimes smaller amounts of chromium and molybdenum
[C20: from perm(eability) + alloy]

Collins English Dictionary - Complete & Unabridged 10th Edition
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