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Webster's 1828 Dictionary

ELECTRO-MAGNETISM

n.That science which treats of the agency of electricity and galvanism in communicating magnetic properties.

 

Webster's 1913 Dictionary

ELECTRO-MAGNETISM

ELECTRO-MAGNETISM E *lec `tro-mag "net *ism, n.

 

Defn: The magnetism developed by a current of electricity; the science which treats of the development of magnetism by means of voltaic electricity, and of the properties or actions of the currents evolved.