Electro-magnetic \E*lec`tro-mag*net"ic\, a.
Of or pertaining to {electromagnetism}.
[1913 Webster]
{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.
[1913 Webster]