compact disk

noun
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
Compare optical disk ( def 1 ).
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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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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00:10
Compact disk is always a great word to know.
So is flibbertigibbet. Does it mean:
a chattering or flighty, light-headed person.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
Example sentences
The same standards that apply to copyright restrictions on printed materials
  also apply to materials recorded on compact disk.
It is available in printed and compact disk versions.
For several years, computer designers have sought to develop technology that
  could harness the compact disk for storing data.
Compact disk and paper format will no longer be available.
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