chassis
n. countablen. the strong frame that supports the body of a car or other vehicle. It is the base that holds the engine and wheels in place.
n. the internal framework or structural support system of a motor vehicle or other wheeled object. It serves as the base upon which the body and mechanical components are mounted.
The mechanic checked the car's chassis for rust.
Heavy-duty trucks require a reinforced chassis to handle the weight of the cargo they carry across rough terrain.
Engineers redesigned the aluminum chassis to reduce the vehicle's overall weight while maintaining the structural integrity required for high-speed cornering and impact safety.
Borrowed from French châssis, from châsse, from Latin capsa (“case”).
The plural form is spelled the same ('chassis') but the final 's' is pronounced as a 'z' sound.