speedometer
noun
speed·om·e·ter spi-ˈdä-mə-tər 
1
: an instrument for indicating speed : tachometer
2
: an instrument for indicating distance traversed as well as speed of travel
also : odometer
Example Sentences
Recent Examples on the Web The total diameter of the wheel and tire should stay the same to keep the odometer and speedometer accurate — but that means as wheels get bigger, tires get thinner. 
Nerdwallet, cleveland, 6 Aug. 2022 While that may sound a bit slow, look at the speedometer the next time you are stuck in traffic – the most frustrating congestion happens below 30 mph. Michael Harley, Forbes, 2 Aug. 2022 Drivers also need to watch the speedometer and slow down when necessary, especially when there are lots of pedestrians around. Catherine Garcia, The Week, 11 Aug. 2022 The instrument panel cluster may not properly illuminate telltales or gauges and the speedometer and tachometer pointers. USA TODAY, 24 June 2022 There has been no teeth-gnashing over handing the keys to a teenager who wants to bury the speedometer needle or burn tires at stoplights. Bryce Millercolumnist, San Diego Union-Tribune, 18 May 2022 An analog speedometer and tachometer frame a small but easy-to-read 4.2-inch info display. Greg Fink, Car and Driver, 25 Apr. 2022 For some, the obsession is all about the adrenaline rush as danger rises with the speedometer. NBC News, 22 Apr. 2022 Some other highlights include an optimistic 100-mph speedometer and an ashtray in the center console. Carlos Lago, Car and Driver, 7 Apr. 2022 See More
Nerdwallet, cleveland, 6 Aug. 2022 While that may sound a bit slow, look at the speedometer the next time you are stuck in traffic – the most frustrating congestion happens below 30 mph. Michael Harley, Forbes, 2 Aug. 2022 Drivers also need to watch the speedometer and slow down when necessary, especially when there are lots of pedestrians around. Catherine Garcia, The Week, 11 Aug. 2022 The instrument panel cluster may not properly illuminate telltales or gauges and the speedometer and tachometer pointers. USA TODAY, 24 June 2022 There has been no teeth-gnashing over handing the keys to a teenager who wants to bury the speedometer needle or burn tires at stoplights. Bryce Millercolumnist, San Diego Union-Tribune, 18 May 2022 An analog speedometer and tachometer frame a small but easy-to-read 4.2-inch info display. Greg Fink, Car and Driver, 25 Apr. 2022 For some, the obsession is all about the adrenaline rush as danger rises with the speedometer. NBC News, 22 Apr. 2022 Some other highlights include an optimistic 100-mph speedometer and an ashtray in the center console. Carlos Lago, Car and Driver, 7 Apr. 2022 See More Word History
Etymology
speed entry 1 + -o- + -meter
First Known Use
1903, in the meaning defined at sense 1
Kids Definition
speedometer
noun
speed·om·e·ter spi-ˈdä-mə-tər
: an instrument that measures speed