disk

Definition (noun): something with a round shape resembling a flat circular plate

Example: the moon’s disk hung in a cloudless sky

Definition (noun): a flat circular plate

Definition (noun): sound recording consisting of a disk with a continuous groove; used to reproduce music by rotating while a phonograph needle tracks in the groove

Definition (noun): (computer science) a memory device consisting of a flat disk covered with a magnetic coating on which information is stored

Definition (verb): draw a harrow over (land)