| 释义 |
trac·er
I. \ˈtrāsə(r)\ noun
(-s)
Etymology: trace (II) + -er
1. : one that traces, tracks down, or searches out: as
a. : seeker b
b. : a person professionally engaged in the tracing of missing persons or property and especially of goods lost in transit
c. : a form or inquiry sent out to facilitate the tracing of an article or shipment lost in transit
2. : one that makes tracings or traceries: as
a. : a draftsman, gilder, stainer, or other worker that traces designs, patterns, or markings
b. : one that traces (as drawings) on semitransparent paper or cloth especially for blueprint reproduction — compare tracing cloth, tracing paper
3. : a device (as a stylus) used in tracing a design or other matter: as
a. : tracing wheel
b. : a tempered steel punch used in chasing or repoussé work on metal (as when cutting the outline of a design or when making and finishing corners or borders)
4.
a. or tracer ammunition : ammunition containing a chemical composition to mark the flight of projectiles by a trail of smoke or fire
b. : a substance (as a fluorescent dye) used to trace the course of a process; specifically : a labeled element or atom that can be traced throughout chemical, biological, or physical processes by its radioactivity or its unusual isotopic mass
< radioactive tracers administered to patients accumulate in tumors and other pathological tissue, where they can be detected >
II. noun
(-s)
Etymology: trace (III) + -er
: trace horse |