Definition of Tracer

1. Noun. An investigator who is employed to find missing persons or missing goods.

2. Noun. An instrument used to make tracings.
Generic synonyms: Instrument
Derivative terms: Trace, Trace

3. Noun. (radiology) any radioactive isotope introduced into the body to study metabolism or other biological processes.
Category relationships: Radiology
Generic synonyms: Radioisotope

4. Noun. Ammunition whose flight can be observed by a trail of smoke.
Exact synonyms: Tracer Bullet
Generic synonyms: Ammo, Ammunition

Definition of Tracer

1. n. One who, or that which, traces.

2. n. A person engaged (esp. in the express or railway service) in tracing, or searching out, missing articles, as packages or freight cars.

Definition of Tracer

1. Noun. (chemistry) A chemical used to track the progress or history of a natural process. ¹

2. Noun. A piece of ammunition for a firearm that contains magnesium or another flammable substance arranged such that it will burn and produce a visible trail when fired at night. ¹

3. Noun. The act of tracking or investigating something. ¹

4. Noun. A person who traces something. ¹

¹ Source:

Definition of Tracer

1. one that traces [n -S] - See also: traces

Medical Definition of Tracer

1. 1. An element or compound containing atoms that can be distinguished from their normal counterparts by physical means (e.g., radioactivity assay or mass spectrography) and can thus be used to follow (trace) the metabolism of the normal substances. 2. A coloured substance (e.g., a dye) used as a tracer to follow the flow of water. 3. An instrument used in dissecting out nerves and blood vessels. 4. A mechanical device with a marking point attached to one jaw and a graph plate or tracing plate attached to the other jaw; used to record the direction and extent of movements of the mandible. See: tracing. Origin: M.E. Track, fr. O. Fr. Tracier, to make one's way, fr. L. Traho, pp. Tractum, to draw, + -er, agent suffix (05 Mar 2000)

Tracer Pictures

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Lexicographical Neighbors of Tracer

trace fossil
trace fossils
trace nutrient
trace program
tracer (current term)
tracer bullet
tracheal branches

Literary usage of Tracer

Below you will find example usage of this term as found in modern and/or classical literature:

1. The Theory and Practice of Absolute Measurements in Electricity and Magnetism by Andrew Gray (1893)
"Searle's Magnetic Curve- tracer. in DD, and resisted by tbe tension of the wire. ... Ewing has found by means of his curve-tracer Hint, while with thin bars ..."

2. Naval Ordnance: A Text-book Prepared for the Use of the Midshipmen of the by Roland Irvin Curtin, Thomas Lee Johnson, United States Naval Academy (1915)
"The tracer (Plate IV, Fig. 1) is used in order to make it possible to spot at ... There is a small air-chamber at the mouth of the tracer covered by a metal ..."

3. Railroad Traffic and Rates by Emory Richard Johnson, Grover Gerhardt Huebner (1911)
"... receipt: or if snort, give reference to Snort Report and any information noted on vay-bi/l as to shortage, returning tracer direct to Dote 190 Agnt.. ..."

4. The Polar Planimeter and Its Use in Engineering Calculations: Together with by Joseph Yendes Wheatley (1903)
"From this description it will be seen that the tracer T revolves about the ... tracer AHM AND ITS GRADUATION. In all the better forms of Planimeters the ..."

5. Transactions of the Royal Institution of Naval Architects by Royal Institution of Naval Architects (1867)
"The Wave-tracer. THE various alterations lately made in naval construction have produced very remarkable improvements. Vessels of such high speed and strong ..."

6. Radionuclide Retention in Geologic Media: Workshop Proceedings, Oskarshamn by Svensk kärnbränslehantering AB., OECD Nuclear Energy Agency (2002)
"Included in the objectives of this test cycle was a demonstration of transfer of tracer-test techniques and methodologies to the ambient hydraulic pressure ..."

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