1. past tense and past participle of demagnetise; to remove magnetic properties from an object or material
Usage: British spelling; American equivalent is 'demagnetized'; commonly used in physics and engineering contexts

Examples

• The technician demagnetised the metal rod by heating it above its Curie temperature.
• Once the compass was demagnetised, it no longer pointed north.
• The old hard drive was demagnetised to ensure data security before disposal.
• They demagnetised the steel tools to prevent interference with sensitive equipment.
• The magnetic field was demagnetised using an alternating current coil.