deperm UK /diːˈpɜːm/US /diˈpɝm/noun 1verb 1forms 3 noun1 •The act or process of deperming. verb1 •To degauss or demagnetize; especially, to degauss a ship by dragging a large powered electrical cable along its side.Our present system deperms more reliably and is arranged to deperm the sensor each time the power source for the magnetometer is turned on. — 1964 formsdepermed · deperming · deperms