A thin, flat, circular plate or similar object.

(figurative) Something resembling a disk.

(anatomy) An intervertebral disc

(computer hardware) Ellipsis of floppy disk - removable magnetic medium or a hard disk - fixed, persistent digital storage.

(computer hardware, nonstandard) A disc - either a CD-ROM, an audio CD, a DVD or similar removable storage medium.

(agriculture) A type of harrow.

(botany) A ring- or cup-shaped enlargement of the flower receptacle or ovary that bears nectar or, less commonly, the stamens.

(agriculture) To harrow.

(aviation, of an aircraft's propeller) To move towards, or operate at, zero blade pitch, orienting the propeller blades face-on to the oncoming airstream and maximizing the drag generated by the propeller.