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Meaning of deperm

de•perm

Pronunciation: (dē-pûrm'), [key]
— v.t. Naut.
  1. to reduce the permanent magnetism of (a vessel) by wrapping an electric cable around it vertically athwartships and energizing the cable. Cf. degauss.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.