Disk (noun)

1. A flat, circular plate or object.
2. A storage device in a computer, usually a hard disk or a compact disk.
3. A thin plate or a flat circular piece used in games such as Frisbee or disk golf.
4. The central part of a wheel or a steering mechanism.
5. The component of a phonograph or a turntable that rotates and carries the record.

Origin:

The word "disk" originated from the old french word "disque" meaning "plate", which was borrowed from the latin "discus" meaning "quoit, disk".

Examples:

1. She put the disk into the computer to access her files.
2. The disk jockey played the latest hits on the turntable.
3. The disk golf player threw the Frisbee towards the basket.
4. The disk brakes on his bike made it easier to stop.
5. He had a collection of phonograph disks in his attic.