compact disk

noun
an optical disk approximately 4.75 inches (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
Compare optical disk ( def 1 ).
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Science Dictionary
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
For several years, computer designers have sought to develop technology that
  could harness the compact disk for storing data.
No compact disk system currently allows consumers to record music.
First came the book, then the show, and now the major-label compact disk.
It is available in printed and compact disk versions.
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