an optical disk approximately 4 3 / 4 in. (12 cm) in diameter, on which a program, data, music, etc., is digitally encoded for a laser beam to scan, decode, and transmit to a playback system, computer monitor, or television set. Abbreviation: CD
compact disk or compact disc (kŏm'pākt') Pronunciation Key
A small optical disk on which data such as music, text, or graphic images is digitally encoded.