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tachometer

[ta-kom-i-ter, tuh-] /tæˈkɒm ɪ tər, tə-/
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
1800-1810
1800-10; tacho- + -meter
Related forms
tachometrically
[tak-uh-me-trik-lee] /ˌtæk əˈmɛ trɪk li/ (Show IPA),
adverb
tachometry, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for tachometry

tachometer

/tæˈkɒmɪtə/
noun
1.
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
Derived Forms
tachometric (ˌtækəˈmɛtrɪk), tachometrical, adjective
tachometrically, adverb
tachometry, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for tachometry

tachometer

n.

1810, from Greek tachos "speed" + -meter.

Online Etymology Dictionary, © 2010 Douglas Harper
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tachometry in Medicine

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 Article for tachometry

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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