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Speedometer

//spɪˈdɒm.ɪ.tə(ɹ)// noun

Noun

1
An instrument located within the dashboard of a vehicle that measures and indicates the current speed of the vehicle.
"Although it might be thought that drivers would naturally refer constantly to the speedometer, older drivers who come to diesel driving after years of steam experience without the help of speedometers, as well as those on steam engines which have been equipped with speedometers in recent years, have not accustomed themselves to the constant use of this instrument."
2
a meter fixed to a vehicle that measures and displays its speed wordnet
3
Such a device incorporating an odometer.

From speed + -o- + -meter; by surface analysis, speed + -ometer.

Unscramble this word: speedometer