chassis

 
Pronunciation: /ˈʃasi, -iː/

noun (plural /-sɪz/)

  • the base frame of a car, carriage, or other wheeled vehicle.
  • the outer structural framework of a piece of audio, radio, or computer equipment.

Origin:

early 20th century: from French châssis 'frame', based on Latin capsa 'box' (see case2)