speedometer

[ spee-dom-i-ter, spi- ]
/ spiˈdɒm ɪ tər, spɪ- /

noun

an instrument on an automobile or other vehicle for indicating the rate of travel in miles or kilometers per hour.

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Origin of speedometer

First recorded in 1900–05; speed + -o- + -meter
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for speedometer

speedometer
/ (spɪˈdɒmɪtə) /

noun

a device fitted to a vehicle to measure and display the speed of travelSee 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

Scientific definitions for speedometer

speedometer
[ spĭ-dŏmĭ-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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.