
1) Measuring instrument 2) Scientific instrument 3) Strobe 4) Strobe light
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1) Strobe
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https://www.crosswordclues.com/clue/stroboscope

A stroboscope, also known as a strobe, is an instrument used to make a cyclically moving object appear to be slow-moving, or stationary. The principle is used for the study of rotating, reciprocating, oscillating or vibrating objects. Machine parts and vibrating strings are common examples. Intense flashing/pulsing light of various frequencies can...
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http://en.wikipedia.org/wiki/Stroboscope

Instrument for the periodic illumination of stationary, rotating or vibrating bodies at the same frequency as the body is moving, thus making the bodies appear non-moving.
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http://jot101.com/2015/05/a-z-of-science-fiction-words/

instrument for studying motion using flashes of light
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• (n.) An optical toy similar to the phenakistoscope. See Phenakistoscope. • (n.) An instrument for studying or observing the successive phases of a periodic or varying motion by means of light which is periodically interrupted.
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http://thinkexist.com/dictionary/meaning/stroboscope/

instrument that provides intermittent illumination of a rotating or vibrating object in order to study the motion of the object or to determine its ... [2 related articles]
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http://www.britannica.com/eb/a-z/s/173

Strob'o·scope noun [ Greek ... a whirling + -scope .] 1. An instrument for studying or observing the successive phases of a periodic or varying motion by means of light which is periodically interrupted. 2. An optical toy similar to the phenakistoscope. See Phenakistoscope
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http://www.encyclo.co.uk/webster/S/212

Type: Term Pronunciation: strō′bō-skōp Definitions: 1. An electronic instrument that produces intermittent light flashes of controlled frequency; used to influence electrical activity of the cerebral cortex.
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http://www.medilexicon.com/medicaldictionary.php?t=85612

[
n] - scientific instrument that provides a flashing light synchronized with the periodic movement of an object
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http://www.webdictionary.co.uk/definition.php?query=stroboscope

A luminaire which produces a rapidly flashing, intense light.
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https://hdos.org.uk/gen/glossary.html
strobe noun scientific instrument that provides a flashing light synchronized with the periodic movement of an object; can make moving object appear stationary
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https://www.encyclo.co.uk/local/20974

Instrument for studying continuous periodic motion by using light flashing at the same frequency as that of the motion; for example, rotating machinery can be optically `stopped` by illuminating it with a stroboscope flashing at the exact rate of rotation
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https://www.encyclo.co.uk/local/21221

a device for studying the motion of a body, esp. a body in rapid revolution or vibration, by making the motion appear to slow down or stop, as by periodically illuminating the body or viewing it through widely spaced openings in a revolving disk. · · Also calledstrobe, strobe light, stro&prim;boscop&prim;ic lamp&prim;.a l...
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https://www.infoplease.com/dictionary/stroboscope
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