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Webster's 1828 Dictionary

ELECTRO-MAGNETIC

a.Designating what pertains to magnetism, as connected with electricity, or affected by it. Electromagnetic phenomena.

Webster's 1913 Dictionary

ELECTRO-MAGNETIC

ELECTRO-MAGNETIC E *lec `tro-mag *net "ic, a.

Defn: Of, Pertaining to, or produced by, magnetism which is developed by the passage of an electric current. Electro-magnetic engine, an engine in which the motive force is electro-magnetism. -- Electro-magnetic theory of light (Physics ), a theory of light which makes it consist in the rapid alternation of transient electric currents moving transversely to the direction of the ray.