DISK

I. noun or disc Usage: often attributive see: dish Date: 1664 1. the seemingly flat figure of a celestial body , discus , any of various rounded and flattened animal anatomical structures, the central part of the flower head of a typical composite made up of closely packed tubular flowers, a thin circular object: as, a phonograph record, a round flat plate coated with a magnetic substance on which data for a computer is stored, optical ~ : as, videodisc , cd , one of the concave circular steel tools with sharpened edge making up the working part of a disc harrow or plow, ~like adjective II. transitive verb or disc Date: circa 1884 to cultivate with an implement (as a harrow or plow) that turns and loosens the soil with a series of discs