{"era":"current","word":"electromagnetic","meaning":"relating to both electricity and magnetism","children":[{"era":"1800s","word":"electro- + magnetic","meaning":"combining electricity and magnetism","children":[{"era":"classical","word":"electro-","meaning":"amber; by extension electricity","children":[],"language":"Greek"},{"era":"classical","word":"magnetic","meaning":"relating to magnetism","children":[],"language":"Greek via Latin"}],"language":"Modern scientific English"}],"language":"Modern English"}