discount

1. A phonograph record.
2. A round flat plate coated with a magnetic substance on which data for a computer is stored.

A round, flat piece of nonmagnetic, shiny metal encased in a plastic coating, designed to be read from and written to by optical (laser) technology. It is now standard practice to use the spelling disc for optical discs and disk in all other computer contexts, such as floppy disk, hard disk, and RAM disk. See also compact disc. See disk.

To cultivate with an implement (as a harrow or plow) that turns and loosens the soil with a series of discs.