ETYM French châssis.
1. A metal mounting for the circuit components of an electronic device.
2. Steel frame supported on springs that holds the body and motor of a motor vehicle.
3. A metal frame on which electronic components, such as printed circuit boards, fans, and power supplies, are mounted. See the illustration.

ETYM Old Fren. trestel, tresteay, French tréteau; probably from Latin transtillum a little crossbeam, dim. of transtrum a crossbeam. Related to Transom.
1. A tower-like framework used to support a bridge.
2. Sawhorses used in pairs to support a horizontal tabletop.

Framework that supports the body of a vehicle.