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“chronoscope”
An instrument for observing and the precise measuring of minute time intervals of extremely brief periods of time: A chronoscope is an electronic device used for measuring extremely short intervals of time, such as the time it takes for a rifle bullet to pass between two points.
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chrono-, chron-
(page 5)
scopo-, scop-, scept-, skept-, -scope-, -scopy, -scopia, -scopic, -scopist
(page 6)