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optical disk
op·ti·cal disk (plural op·ti·cal disks)


noun 
Definition:
 
computer disk read by laser: a rigid computer storage disk with data stored as tiny pits in the plastic coating, readable by laser beam
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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