[{"Bold_text": "adjective", "List Items": ["pertaining to or situated at the center ; central .", "Anatomy, Physiology.pertaining to or at a nerve center nerve center."]}, {"Bold_text": null, "List Items": ["a combining form with the meanings “having a center or centers” of the specified number or kind (polycentric); “centered upon, focused around” that named by the first element (ethnocentric; heliocentric)."]}]