tachometer

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English[edit]

Alternative forms[edit]

Etymology[edit]

tachy- +‎ -meter

Noun[edit]

tachometer (plural tachometers)

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

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