compact disk com·pact·disk uncommon noun 1. a digitally encoded recording on an optical disk that is smaller than a phonograph record; played back by a laser Synonymscompact diskcompact discCD Related words Word family compact-disk burner Broader terms optical diskrecording Narrower terms audio CDCD-RCD-ROM WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
