compact disc(n = noun.artifact) cd, compact disk - a digitally encoded recording on an optical disk that is smaller than a phonograph record; played back by a laser; Array
is a kind of optical disc, optical disk, recording
has particulars: audio cd, audio compact disc, cd-r, cd-wo, compact disc recordable, compact disc write-once, cd-rom, compact disc read-only memory

   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. [WordNet 1.5]

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