#compact_disk__compactdisk__compact_disc__compactdisc__CD  a recording that is smaller than a phonograph record; played back by a laser
  supertype:  #recording.memory_device  a storage device on which information (sounds or images) have been recorded
  subtype:  #audio_CD__audio_compact_disc__audiocompactdisc  compact discs used to reproduce sound (voice and music)
  subtype:  #CD-R__compact_disc_recordable__CD-WO__compact_disc_write-once  a compact disc on which you can write only once and thereafter is read-only memory
  subtype:  #CD-ROM__compact_disc_read-only_memory  a compact disk that is used with a computer (rather than with an audio system); a large amount of digital information can be stored and accessed but it cannot be altered by the user

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