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speedometer

[spee-dom-i-ter, spi-] /spiˈdɒm ɪ tər, spɪ-/
noun
1.
an instrument on an automobile or other vehicle for indicating the rate of travel in miles or kilometers per hour.
Origin of speedometer
1900-1905
First recorded in 1900-05; speed + -o- + -meter
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for speedometer

speedometer

/spɪˈdɒmɪtə/
noun
1.
a device fitted to a vehicle to measure and display the speed of travel See also mileometer
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 speedometer
n.

1904, from speed + -meter. A Germanic-Greek hybrid and thus execrated by purists.

[T]he ancient Greeks & Romans knew what speed was, & yet no-one supposes they called it speed, whence it follows that speedo- & speedometer are barbarisms. [Fowler]

Online Etymology Dictionary, © 2010 Douglas Harper
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speedometer in Science
speedometer
  (spĭ-dŏm'ĭ-tər)   
An instrument for indicating the speed of a vehicle, typically by measuring the rate of rotation of a wheel or fan whose rate of rotation depends on the speed of the vehicle. Compare odometer.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Word Value for speedometer

16
18
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