ta·chom·e·ter

[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

tach·o·met·ri·cal·ly [tak-uh-me-trik-lee] , adverb
ta·chom·e·try, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
tachometer (tæˈkɒmɪtə) [Click for IPA pronunciation guide]
 
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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Tachometer is always a great word to know.
So is bezoar. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
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
By using a tachometer to measure actual motor speed, it is possible to
  calculate motor loads.
Determine and record the operating speeds of the equipment with a tachometer or
  strobe.
There are a few changes inside, too, including touches such as blue lighting
  inside the tachometer ring.
The speedometer, tachometer and fuel gauges are all important.
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