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  • optical disc A rigid medium, generally a polycarbonate substrate coated with a reflective aluminum layer, that stores information (such as audio, video or data) as digital bits in the form of variations in the reflective surface, and that modulates a laser beam...
  • CD-ROM (compact disc read-only memory) An adaptation by Philips and Sony of their audio compact disc technology for optical disc data storage and retrieval. Current capacity of a disc is 0.5 to 0.6 gigabytes of information.
  • scanning disc In field-sequential color television, the rotating tricolor disc placed between the subject and the lens, or between the picture tube and the viewer.
  • disc A piece of glass that eventually becomes the bifocal segment as it appears prior to being fused to the blank.
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