[{"Bold_text": "noun", "List Items": ["a nonconducting substance; insulator.", "a substance in which an electric field electric fieldcan be maintained with a minimum loss of power."]}, {"Bold_text": "adjective", "List Items": ["of or relating to a dielectric substance."]}, {"Bold_text": "Adjective", "List Items": null}, {"Bold_text": "Noun", "List Items": null}]