Marvel comics villain who is a powerful mutant and an adversary of the X-Men
The answer is:
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Magneto- () — A prefix meaning pertaining to, produced by, or in some way connected with, magnetism.
Magneto-electric (a.) — Alt. of Magneto-electrical
Magneto-electrical (a.) — Pertaining to, or characterized by, electricity by the action of magnets; as, magneto-electric induction.
Magneto-electricity (n.) — Electricity evolved by the action of magnets.
Magneto-electricity (n.) — That branch of science which treats of the development of electricity by the action of magnets; -- the counterpart of electro-magnetism.