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 of tachometer

First recorded in 1800–10; tacho- + -meter
Related formstach·o·met·ri·cal·ly [tak-uh-me-trik-lee] /ˌtæk əˈmɛ trɪk li/, adverbta·chom·e·try, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for tachometry

tachometer

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 Formstachometric (ˌtækəˈmɛtrɪk) or tachometrical, adjectivetachometrically, adverbtachometry, 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

Word Origin and History for tachometry

tachometer

n.

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

Online Etymology Dictionary, © 2010 Douglas Harper

tachometry in Medicine

tachometer

[tă-kŏmĭ-tər]
n.
  1. 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.