<p><strong>Noun</strong></p><ul><li>a person or thing that traces</li><li>a person whose business or work is the tracing of missing property, parcels, persons, etc.</li><li>an inquiry sent from point to point to trace a missing shipment, parcel, or the like, as in a transportation system</li><li>any of various devices for tracing drawings, plans, etc.</li><li>ammunition containing a chemical substance that causes a projectile to trail smoke or fire to make its path visible and indicate a target to other firers, especially at night</li><li>the chemical substance contained in such ammunition</li><li>a substance, especially a radioactive one, traced through a biological, chemical, or physical system in order to study the system</li></ul>