Magnetism or a magnet.
English magnet plus ‑o‑.
A magneto-optical device employs both optical and magnetic technologies, as some computer storage media do; the adjective magneto-electric refers to the electric currents generated in a material by its motion in a magnetic field; magnetoresistance is the dependence of the electrical resistance of a body on an external magnetic field; the magnetosphere surrounding the earth is the region in which its magnetic field predominates over others.
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