• Noun

    a person or thing that traces.
    a person whose business or work is the tracing of missing property, parcels, persons, etc.
    an inquiry sent from point to point to trace a missing shipment, parcel, or the like, as in a transportation system.
    any of various devices for tracing drawings, plans, etc.
    Also called tracer ammunition. 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, esp. at night.
    the chemical substance contained in such ammunition.
    a substance, esp. a radioactive one, traced through a biological, chemical, or physical system in order to study the system.
    Lấy từ « http://tratu.soha.vn/dict/en_en/Tracer »

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