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Webster 1913 Edition

Adj.

Of or pertaining to

Electro-magnetic engine

an engine in which the motive force is electro-magnetism.

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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.

Adj.

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