The Collaborative International Dictionary of English v.0.48:

videocasette \videocasette\ n.
   a casette containing magnetic tape, which can be used in a
   videocasette recorder to record and play back electronic
   signals, such as from television programs. The long magnetic
   tape in the videocasette is moved between two spindles, and a
   small portion of the tape at any one time is passed over a
   recording or playback head.
   [PJC]