"deperm : (transitive, chiefly nautical) To degauss or demagnetize; especially, to degauss a ship by..."

“deperm : (transitive, chiefly nautical) To degauss or demagnetize; especially, to degauss a ship by dragging a large powered electrical cable along its side.”

- https://en.wiktionary.org/wiki/deperm#English

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