IPA: /ˈdrʌmər/
KK: /ˈdrʌmɚ/
A person who plays a drum, especially in a musical group or band.
The drummer kept the beat for the entire song.
**Drummer** → The word 'drummer' is formed from 'drum' (from Middle English *drom*, meaning a percussion instrument) and '-er' (meaning a person who performs an action). A drummer is a person who plays the drum.
Think of someone who plays a 'drum' — the '-er' just means a person. So, a drummer is simply a person who plays the drum.