GNU Collaborative International Dictionary of English

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1.       
   compact disc, compact disk (kŏmˈpăkt dĭskˌ), n. a disk-shaped optical data storage medium approximately 4-3/4 in. in diameter, which stores binary data as microscopic nonreflective holes or pits in an otherwise reflective surface, and is recorded and played back by rotation in an electronic device containing a laser.  It is often referred to by its abbreviation CD.  It is a type of optical data storage medium.  Compact disks are used for recordings of music as well as of data for computer applications.
   
   Syn. -- CD.
   
   [WordNet 1.5 +PJC]