Etymology
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chassis (n.)

"base frame of an automobile," 1903, American English; earlier "sliding frame or carriage-base for a large gun" (1869), "window frame" (1660s), from French châssis "frame," Old French chassiz (13c.) "frame, framework, setting," from chasse "case, box, eye socket, snail's shell, setting (of a jewel)," from Latin capsa "box, case" (see case (n.2)) + French -is, collective suffix for a number of parts taken together. Compare sash (n.2).

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Definitions of chassis

chassis (n.)
alternative names for the body of a human being;
Synonyms: human body / physical body / material body / soma / build / figure / physique / anatomy / shape / bod / frame / form / flesh
chassis (n.)
a metal mounting for the circuit components of an electronic device;
chassis (n.)
the skeleton of a motor vehicle consisting of a steel frame supported on springs that holds the body and motor;
From wordnet.princeton.edu