1. a person who rings a bell, especially as a job or duty
Usage: often historical or formal context
2. a bell that is rung, or the sound produced by ringing a bell
Usage: archaic or dialectal

Examples

• The church knoller rang the bells every Sunday morning.
• The knoller's duty was to announce important events to the townspeople.
• In medieval times, a knoller would signal the time of day by ringing the church bell.
• The solemn knoller echoed through the village at dawn.