optical disk

Từ điển WordNet v3.1 - WordNet Dictionary

noun

a disk coated with plastic that can store digital data as tiny pits etched in the surface;
is read with a laser that scans the surface
• Syn:
optical disc
• Hypernyms:
memory device, storage device
• Hyponyms:
compact disk, compact disc, CD, videodisk, videodisc, DVD