tachometer

[ta-kom-i-ter, tuh-]
noun
1.
any of various instruments for measuring or indicating velocity or speed, as of a machine, a river, or the blood.
2.
an instrument measuring revolutions per minute, as of an engine.

Origin:
1800–10; tacho- + -meter

tachometrically [tak-uh-me-trik-lee] , adverb
tachometry, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
tachometer (tæˈkɒmɪtə)
 
n
any device for measuring speed, esp the rate of revolution of a shaft. Tachometers (rev counters) are often fitted to cars to indicate the number of revolutions per minute of the engine
 
tachometric
 
adj
 
tacho'metrical
 
adj
 
tacho'metrically
 
adv
 
ta'chometry
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

tachometer
1810, from Gk. tachos "speed" + Eng. -meter, on model of barometer, etc.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

tachometer ta·chom·e·ter (tā-kŏm'ĭ-tər, tə-)
n.
An instrument used to measure the rotations per minute of a rotating shaft.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Britannica
Encyclopedia

tachometer

device for indicating the angular (rotary) speed of a rotating shaft. The term is usually restricted to mechanical or electrical instruments that indicate instantaneous values of speed in revolutions per minute, rather than devices that count the number of revolutions in a measured time interval and indicate only average values for the interval.

Learn more about tachometer with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The speedometer, tachometer and fuel gauges are all important.
Dashboard houses a kilowatt power meter instead of a tachometer.
The big, round traditional tachometer is cheek-by-jowl with a cheap-looking
  rectangle with digital readouts.
There are a few changes inside, too, including touches such as blue lighting
  inside the tachometer ring.
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