tachometer

noun ta·chom·e·ter \ ta-ˈkä-mə-tər , tə- \
Updated on: 24 Nov 2017

Definition of tachometer

: a device for indicating speed of rotation

Recent Examples of tachometer from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'tachometer.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Did You Know?

A tachometer is literally a "speed-measurer", since the Greek root tach- means "speed". This is clear in the names of the tachyon, a particle of matter that travels faster than the speed of light (if it actually exists, it's so fast that it's impossible to see with any instrument), and tachycardia, a medical condition in which the heart races uncontrollably. Since the speed that an auto tachometer measures is speed of rotation of the crankshaft, the numbers it reports are revolutions per minute, or rpm's.

Origin and Etymology of tachometer

Greek tachos speed + English -meter


TACHOMETER Defined for English Language Learners

tachometer

noun

Definition of tachometer for English Language Learners

  • : a device that measures how fast something (such as a wheel) is turning


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