cassette

from WordNet (r) 3.0 (2006)

cassette
    n 1: a container that holds a magnetic tape used for recording
         or playing sound or video

from The Collaborative International Dictionary of English v.0.48

Cassette \Cas`sette"\ Cassette \Cas`sette"\, n. [F., prop., a
   casket, dim. of casse a case. See 1st {Case}.]
   1. Same as {Seggar}.
      [Webster 1913 Suppl.]

   2. a small case to hold a removable part of some mechanism,
      designed for convenience in inserting and removing the
      working part. Most commonly referring to a tape cassette,
      made mostly of plastic, which holds a reel of magnetic
      tape for tape players or tape recorders or video cassette
      recorders. The term may refer, as for tape cassettes, to
      the integrated case plus tape, or sometimes only to the
      case itself separate from the contents.
      [Webster 1913 Suppl. +PJC]