Source : Webster's Revised Unabridged Dictionary (1913)

Chassis \Chas"sis\, n.
   The under part of an automobile, consisting of the frame (on
   which the body is mounted) with the wheels and machinery.

Chassis \Chas"sis\, n. [F. ch[^a]ssis.] (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}.]

Source : WordNet®

chassis
     n 1: alternative names for the body of a human being; "Leonardo
          studied the human body"; "he has a strong physique";
          "the spirit is willing but the flesh is weak" [syn: {human
          body}, {physical body}, {material body}, {soma}, {build},
           {figure}, {physique}, {anatomy}, {shape}, {bod}, {frame},
           {form}, {flesh}]
     2: a metal mounting for the circuit components of an electronic
        device
     3: the skeleton of a motor vehicle consisting of a steel frame
        supported on springs that holds the body and motor