Source : WordNet®

compact disc
     n : a digitally encoded recording on an optical disk that is
         smaller than a phonograph record; played back by a laser
         [syn: {compact disk}, {CD}]

Source : Free On-Line Dictionary of Computing

Compact Disc
     
         (CD) (Not "disk", this spelling is part of the
        standard).
     
        A 4.72 inch disc developed by {Sony} and {Philips} that can
        store, on the same disc, still and/or moving images in
        monochrome and/or color; stereo or two separate sound tracks
        integrated with and/or separate from the images; and digital
        program and information files.
     
        The same fabrication process is used to make both audio CDs
        and {CD-ROMs} for storing computer data, the only difference
        is in the device used to read the CD (the player or drive).
     
        {CD Information Center
        (http://www.cd-info.com/cd-info/CDInfoCenter.html)}.
     
        (1999-06-23)