1. a flat circular plate
Synonym: disk
2. (computer science) a memory device consisting of a flat disk covered with a magnetic coating on which information is stored
Synonym: magnetic diskmagnetic discdisk
3. sound recording consisting of a disk with a continuous groove
used to reproduce music by rotating while a phonograph needle tracks in the groove
Synonym: phonograph recordphonograph recordingrecorddiskplatter
4. something with a round shape resembling a flat circular plate
e.g. the moon's disk hung in a cloudless sky