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chronograph

From Longman Dictionary of Contemporary English
Related topics: Chronology
chronographchron‧o‧graph /ˈkrɒnəɡrɑːf $ ˈkrɑːnəɡræf/ noun [countable]  TMCa scientific instrument for measuring periods of time
Examples from the Corpus
chronographA precision water-resistant chronograph for only %295!The chronograph is the timepiece of choice for today's active man-on-the-go.One speciality was the measurement of high-speed events, such as explosions and gunshots, using his tram chronograph, invented in 1888.
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