Biker (noun)

1. A person who rides a motorcycle, particularly a large, powerful one.
2. A person who is a member of a motorcycle club or gang.

Origin:

From bike + -er.

Examples:

1. He was a biker and loved to ride his motorcycle.
2. She was a biker and often went on long trips.
3. The biker had a leather jacket and a helmet.
4. The biker's motorcycle was loud and powerful.
5. The biker was part of a motorcycle club.