disk

noun

1. A thin, flat, circular plate or similar object.

   “A coin is a disk of metal.”

2. A two-dimensional geometric region, the set of points bounded by a circle.
3. (figuratively)Something resembling a disk.

   “Venus' disk cut off light from the Sun.”

4. An intervertebral disc
5. (dated)A vinyl phonograph/gramophone record.

   “Turn the disk over, after it has finished.”

6. (abbreviation, alt-of, ellipsis)Ellipsis of floppy disk.

   “He still uses disks from 1979.”

7. (abbreviation, alt-of, ellipsis)Ellipsis of hard disk.
8. (abbreviation, alt-of, ellipsis, nonstandard)Ellipsis of optical disk.

   “She burned some disks yesterday to back up her computer.”

9. A type of harrow.
10. A ring- or cup-shaped enlargement of the flower receptacle or ovary that bears nectar or, less commonly, the stamens.

verb

1. To harrow.

   “That is alkali. Mr. Kochendorfer: I have a ten-year apple orchard that I disked last year and kept it tolerably clean this spring.”

   “The next year I plowed and disked the patch of ground and planted potatoes.”

   “The soil is plowed and disked and then seeded with a mixture of prairie plants.”

2. 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.