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