Definition of disk noun from the Oxford Advanced American Dictionary

      

    disk

     noun
    (also disc)noun
    NAmE//dɪsk//
     
     
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  1. 1 (also magnetic disk) (computing) a device for storing information on a computer, with a magnetic surface that records information received in electronic form see also floppy disk, hard disk
  2. 2 a thin, flat, round object Red blood cells are roughly the shape of a disk. He wears an identity disk around his neck.
  3. 3 = CD This recording is available online or on disk.
  4. 4 a structure made of cartilage between the bones of the back He's been out of work with a slipped disk (= one that has moved from its correct position, causing pain).
  5. 5(old-fashioned) = record
See the Oxford Advanced Learner's Dictionary entry: disk