This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Of or exhibiting electromagnetism.

adj. pertaining to electromagnetism

"Electrons are bound to the nuclies by what they call a electromagnetic force, likewise, a group of atoms can remain bound to each other forming a molecule."

electromagnetic units    electromagnetic theory of light    electromagnetic engine   

electro-magnetism   

magnetic    gravitational    thermal    subspace    acoustic