DEMAGNETISE

demagnetize, demagnetise, degauss

(verb) make nonmagnetic; take away the magnetic properties (of); “demagnetize the iron shavings”; “they degaussed the ship”

demagnetize, demagnetise

(verb) erase (a magnetic storage device)

Source: WordNet® 3.1

Etymology

Verb

demagnetise (third-person singular simple present demagnetises, present participle demagnetising, simple past and past participle demagnetised)

(British spelling) To make something non-magnetic by removing its magnetic properties.

Synonym: degauss

To erase the contents of a magnetic storage device.

Source: Wiktionary