compact-disk

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
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