disk (n.)

1660s, "round, approximately flat surface," from Latin discus "quoit, discus, disk," from Greek diskos "disk, quoit, platter," related to dikein "to throw" (see discus).

The American English preferred spelling; also see disc. From 1803 as "thin, circular plate;" sense of "phonograph disk" is by 1888; computing sense is from 1947. Disk jockey first recorded 1941; dee-jay is from 1955; DJ is by 1961; video version veejay is from 1982. Disk-drive is from 1952.

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Definitions of disk
disk (n.)
something with a round shape resembling a flat circular plate;
the moon's disk hung in a cloudless sky
Synonyms: disc / saucer
disk (n.)
a flat circular plate;
Synonyms: disc
disk (n.)
sound recording consisting of a disk with a continuous groove; used to reproduce music by rotating while a phonograph needle tracks in the groove;
Synonyms: phonograph record / phonograph recording / record / disc / platter
disk (n.)
(computer science) a memory device consisting of a flat disk covered with a magnetic coating on which information is stored;
Synonyms: magnetic disk / magnetic disc / disc
disk (v.)
draw a harrow over (land);
Synonyms: harrow