1. a person who rides a bicycle
2. a person who rides a motorcycle

Examples

• The biker pedaled up the steep hill.
• She’s an avid biker who cycles to work every day.
• The mountain biker navigated the rocky trail.
• A group of bikers rode their motorcycles down the highway.
• The leather-clad biker parked his Harley outside the diner.
• Weekend bikers filled the scenic country roads.
• The biker wore a helmet for safety.