CD

1. an acronym for compact disk, a disk-shaped recording of binary data that is smaller than a phonograph record, and is recorded and played back by a compact disk player, an electronic device containing a laser. The term is also used generically to refer to the medium as a data storage medium.
2. a compact disk player.
3. an acronym for certificate of deposit, a debt instrument issued by a bank for a fixed time period, usually paying interest.