## Etymology
A 19th-century compound of electro- (combining form of electric, from Ancient Greek ḗlektron 'amber') + magnetic (from Magnēsia, the region whose lodestone was magnetic).

## AI Etymology
Electromagnetic is a 19th-century compound of electro- (combining form of electric, from Ancient Greek ḗlektron 'amber') + magnetic (from Magnēsia, the region whose lodestone was magnetic). Morphologically, the form is compositional, with the named elements combining to produce the modern spelling and sense. In present use, it is used as an adjective meaning "relating to the interrelation of electric currents and magnetism", so the historical material remains connected with the current sense rather than standing as bare ancestry. The wider English family includes derivatives such as electromagnetically and electromagnetism and related forms such as electric, magnetic, electromagnet, and electromagnetism, showing how the same historical material continues to organize neighboring vocabulary. The named historical forms include Ancient Greek ḗlektron and Ancient Greek Magnēsía, keeping the history tied to concrete forms rather than a loose resemblance.

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