tachometer

About 0.19 uses per million words.

Meaning

1. noun A device for measuring the revolutions per minute (RPMs) of a revolving shaft, as with the driveshaft of an automobile.
2. noun A device for measuring or indicating velocity or speed, as of blood, a river, a machine, etc.

Similar words

tach speedometer chronometric signal tachograph tacho speedo driveshaft idling speed airspeedometer

Often followed by

is and generator to feedback drive or in signal

Word family

tachometers