the.com/electromagnet

means A piece of metal (usually iron) that becomes magnetic only when electric current flows through a coil of wire wrapped around it.

from Built from Greek-rooted 'electro-' (from 'elektron', amber — the stuff ancient Greeks rubbed to produce static charge) plus 'magnet' (from 'Magnesia', a region in Greece associated with naturally magnetic lodestone). The device itself emerged in the early 1800s once scientists discovered that electric current produces a magnetic field — coiling a wire and running current through it turned that discovery into a controllable magnet, and the compound word simply welded the two phenomena together.