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Related to disc: discovery
i. The imaginary surface swept by the rotor blades during their rotation.
ii. That portion of the compressor or the turbine to which blades are attached.
discAn alternate spelling for disk with a "k." Some computer manufacturers use this spelling for magnetic disks, but "disc" usually refers to optical media, such as CDs and DVDs.
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Disc ("c") refers to pure optical media, and disk ("k") refers to magnetic hard disks and floppy disks as well as to disks that use a combination of magnetic and optical technologies (see magneto-optic disk).