Compact disc. the readable surface of a compact disc includes a spiral track wound tightly enough to cause light to diffract into a full visible spectrum. Retailer of music cds movies dvds and video games. Sells cds and videos online. Pronunciation of cd. translations of cd. cd synonyms cd antonyms. information about cd in the free online english dictionary and encyclopedia. audio cd. All about how discs are recorded and played. Compact disk or compact disc ( ) n. ( abbr. cd ) a small optical disk on which data such as music text or graphic images is digitally encoded Cd (1) see also carrier detect and candela . (2) ( c ompact d isc) an optical digital audio disc that contains up to 74 minutes of hi-fi stereo sound Encyclopedia article about cd. information about cd in the columbia encyclopedia computer desktop encyclopedia computing dictionary. audio cd Cd players are often installed into home stereo systems car audio systems and personal computers. they are also manufactured as portable devices..