speedometers is a form of:

Speedometer



noun
1.
(1. An instrument for indicating speed. 2. a. An instrument for indicating distance traveled as well as rate of speed. b. An odometer) សំទង់ ល្បឿន, អ្នករាប់រឺកុងទ័រ, នាឡិកាស្ទង់ល្បឿន