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deperm

[dee-purm] /diˈpɜrm/
verb (used with object), Nautical
1.
to reduce the permanent magnetism of (a vessel) by wrapping an electric cable around it vertically athwartships and energizing the cable.
Compare degauss.
Origin
1945-1950
1945-50; de- + perm(anent)
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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