1. A person that redraws something that somebody else drew without going outside of the original drawing. Banky was accused of being a tracer in the movie Chasing Amy.
  2. A person engaged in searching out missing articles.
  3. Also I believe it is something used in warfare. I think it is a type of bullet that leaves a visible trail.

4. After having ingested LSD or been awake far too long, afterimages of things seen will slowly creep across the surface of the eyes. These are tracers.

(1) a type of ammunition that glows brightly, allowing a marksman to determine where that shot went and adjust accordingly.

(2) a form of hallucination where something percieved (by any of the five senses) is percieved repeatedly, even though the stimulous was only applied once. e.g. a cigarette butt flies past, you see an entire arc of this motion, repeated many times.

A tracer round is a projectile (usually for an automatic weapon) which has been treated with a substance designed to burn and leave a glowing, visible trail. It is used both for aiming purposes as well as for psychological effect; the AC-130H/U Gunship and its ilk use large proportions of tracer in their ground-attack weapons in order to impress upon the intended targets just how much trouble they're in.

Tracers are usually treated with a strontium salt, which will burn (I believe) with a bright orange-red trail. Salts of other compounds can be used to provide tracer paths of different hues. Note that tracer rounds at best cause a requirement for more frequent cleaning of the weapon and at worst the premature erosion of the lands in the barrel and of the breech.

A passenger vehicle (hereafter "car") from the Mercury branch of the Ford Motor Company. It actually is (or was, in the begining) a rebranded Mazda 323. Nice little "Around town putt-putt", but doesn't stand a chance in a collision at any faster than walking pace. Believe me **groan** I know.

A tracer can also be a label (usually a radioisotope, but sometimes a fluorescent molecule) added to a molecule to follow its progress through a (usually biological) pathway. For example, one can administer mescalin which has been labeled with carbon-11 to a rat and measure the distribution of mescalin and its metabolic products in the various organs of the rat with a Geiger counter (it is not known if the rats enjoy their trip.) Other commonly used tracers include deuterium, fluorine-18, oxygen-15 and green-fluorescent protein.

Tra"cer (?), n.

One who, or that which, traces.

 

© Webster 1913


Trac"er (?), n.

1.

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

2.

An inquiry sent out (esp. in transportation service) for a missing article, as a letter or an express package.

 

© Webster 1913

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