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tachometer

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tachometer/tæˈkɑːmətɚ/noun
pluraltachometers
tachometer
/tæˈkɑːmətɚ/
noun
pluraltachometers
Learner's definition of TACHOMETER  
[count]technical
: a device that measures how fast something (such as a wheel) is turning
— see picture at carcompare odometer, speedometer
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