a device that indicates or measures the rotational speed of a spinning shaft
Origin of tachometer; from Classical Greek tachos, speed (; from tachys: see tachy-) + -meter
An instrument used to measure the rotations per minute of a rotating shaft.
Origin of tachometerGreek takhos, speed + –meter.
- A device for measuring the revolutions per minute (RPMs) of a revolving shaft, as with the driveshaft of an automobile.
- A device for measuring or indicating velocity or speed, as of blood, a river, a machine, etc.