verb

• (transitive, chiefly nautical) To degauss or demagnetize; especially, to degauss a ship by dragging a large powered electrical cable along its side.
  "Vessels wiped and depermed as outlined above were found to age towards their original state, so the processes as described were only effective for comparatively short periods and had to be repeated at regular intervals."

noun

• (chiefly nautical) The act or process of deperming.
  "Fortunately a very pronounced extension of life was found to be possible for wipes and deperms by making the initial current very strong so that, for example, a positive component was made a larger negative one before being reduced to zero […]"