[{"Bold_text": "noun", "List Items": ["a person or thing that traces . trace .", "a person whose business or work is the tracing trace missing property, parcels, persons, etc.", "an inquiry sent from point to point to trace missing shipment, parcel, or the like, as in a transportation system.", "any of various devices for tracing trace , plans, etc.", "Also calledtrac?er ammuni?tion.ammunition containing a chemical substance that causes a projectile to trail smoke or fire so as to make its path visible and indicate a target to other firers, especially at night.", "the chemical substance contained in such ammunition.", "a substance, especially a radioactive one, traced trace a biological, chemical, or physical system in order to study the system."]}]