Tachometer

//təˈkɒmətə(ɹ)// noun

Definitions

Noun
  1. 1
    A device for measuring the revolutions per minute (RPMs) of a revolving shaft, as with the driveshaft of an automobile.
  2. 2
    measuring instrument for indicating speed of rotation wordnet
  3. 3
    A device for measuring or indicating velocity or speed, as of blood, a river, a machine, etc.

Etymology

From tacho- + -meter.

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