IPA: //ˈmɛtrəˌnoʊm//
KK: /ˈmɛtrəˌnoʊm/
A device that produces regular sounds or lights to help musicians keep a steady tempo while playing music.
The pianist used a metronome to practice playing at a consistent speed.
Metronome is formed from "metron" (Greek, meaning measure) and "nomos" (Greek, meaning law or rule). The word describes a device that provides a steady beat or measure for musicians.
Think of 'measure' ('metron') and 'law' or 'rule' ('nomos') to remember that a metronome is a device that helps keep a steady measure in music.