tachometer

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