The Collaborative International Dictionary
Electro-magnetism \E*lec`tro-mag"net*ism\ n.
magnetism produced by an electric current.
one of the fundamental forces of nature, responsible for both electrical and magnetic phenomena. Called also the electromagnetic force. Formerly believed to be separate phenomena, electricity and magnetism were shown by experiment and theory to be different aspects of the electromagnetic force. It is responsible for the forces generated between magnetically or electrically charged objects, and is the fundamental force responsible for the characteristics of electromagnetic radiation, including light.
the branch of physics concerned with electromagnetic phenomena.
Usage examples of "electro-magnetism".
A lot of other people, among them the Dutch physicist Hendrik Lorentz and the French mathematician Henri Poincare, were working on the same idea, because electro-magnetism didn't entirely agree with Newtonian mechanics.
When this subject was first mentioned to him, he said he did not know anything of the theory or practice of electro-magnetism, but he would try and find out.
Of course, electro-magnetism is now being used medically with these types of problem.