chassis

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. The rectangular, usually steel frame, supported on springs and attached to the axles, that holds the body and motor of an automotive vehicle.
2. n. The landing gear of an aircraft, including the wheels, skids, floats, and other structures that support the aircraft on land or water.
3. n. The frame on which a gun carriage moves forward and backward.
4. n. The framework to which the components of a radio, television, or other electronic equipment are attached.

Century Dictionary and Cyclopedia

1. n. A kind of traversing frame or movable railway, on which the carriages of guns move backward and forward in action.
2. n. In fortification, the foundation-frame or bed-plate upon which a gun-carriage is supported or adjusted.
3. n. The frame of a motor-car or motor-vehicle, exclusive of the seats or body. It includes the structural elements, the motor and its generator of power, the tanks, transmission-gear, wheels, axles, and springs.

Wiktionary

1. n. A base frame, or movable railway, along which the carriage of a mounted gun moves backward and forward.
2. n. The base frame of a motor vehicle.
3. n. A frame or housing containing electrical or mechanical equipment, such as on a computer.

GNU Webster's 1913

1. n. (Mil.) A traversing base frame, or movable railway, along which the carriage of a barbette or casemate gun moves backward and forward. [See gun carriage.]
2. n. The under part of an automobile or other motor vehicle, consisting of the frame (on which the body is mounted) with the wheels and machinery.

WordNet 3.0

1. n. the skeleton of a motor vehicle consisting of a steel frame supported on springs that holds the body and motor
2. n. alternative names for the body of a human being
3. n. a metal mounting for the circuit components of an electronic device