n. [ F. châssis. ] (Mil.) 1. A traversing base frame, or movable railway, along which the carriage of a barbette or casemate gun moves backward and forward. [ See Gun carriage. ] [ 1913 Webster ]
2. 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. [ Webster 1913 Suppl. +PJC ]