English word tachometer comes from English -meter (Used to form the names of measuring devices.), English tachy- (Fast.)
| Dictionary entry | Language | Definition |
|---|---|---|
| -meter | English (eng) | Used to form the names of measuring devices. |
| tachy- | English (eng) | Fast. |
| tachometer | English (eng) | A device for measuring or indicating velocity or speed, as of blood, a river, a machine, etc.. A device for measuring the revolutions per minute (RPMs) of a revolving shaft, as with the driveshaft of an automobile. |