[{"Bold_text": "noun", "List Items": ["a person or thing that reacts undergoes reaction .", "Electricity.a device whose primary purpose is to introduce reactance a circuit.", "Immunology, Veterinary Medicine.a patient or animal that reacts positively towards a foreign material.", "Physics. nuclear reactor(def) nuclear reactor(def).", "Chemistry.(especially in ) a large container, as a vat, for processes in which the substances involved undergo a chemical reaction."]}]