From The Collaborative International Dictionary of English v.0.48 [gcide]:
compact disc \com"pact disc'\, compact disk \com"pact disk'\(k[o^]m"p[a^]kt d[i^]sk'), noun 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.
From WordNet (r) 3.0 (2006) [wn]:
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