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deperm

[dee-purm]
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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.
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Compare degauss.

Origin of deperm

First recorded in 1945–50; de- + perm(anent)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018