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Tracer may refer to:

  • Histochemical tracer, a substance used for tracing purposes in histochemistry, the study of the composition of cells and tissues
  • Isotopic tracer, a substance with an isotope that has been enriched to a greater level than that found in nature
  • Radioactive tracer, a substance containing a radioisotope that is used for tracking purposes
  • Flow tracer, any fluid property used to track fluid motion:
  • Tracer ammunition, special bullets that burn brightly to enable the shooter to follow the bullets' trajectories
  • Mercury Tracer, an automobile
  • TRACER (cosmic ray detector) (Transition Radiation Array for Cosmic Energetic Radiation), a balloon-borne cosmic ray detector
  • TRACER (Tactical Reconnaissance and Counter Concealment Enabled Radar) is a mid-range, long wavelength synthetic aperture radar system developed by the United States Army.
  • Grumman E-1 Tracer, a carrier-borne early warning aircraft used by the United States Navy in the 1960s.


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