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The Collaborative International Dictionary of English v.0.48 (gcide)

Chapeau \Cha`peau"\, n.; pl. {Chapeux}. [F., fr. OF. chapel hat.
See {Chaplet}.]
1. A hat or covering for the head.
[1913 Webster]

2. (Her.) A cap of maintenance. See {Maintenance}.
[1913 Webster]

{Chapeau bras}[F. chapeau hat bras arm], a hat so made that
it can be compressed and carried under the arm without
injury. Such hats were particularly worn on dress
occasions by gentlemen in the 18th century. A chapeau bras
is now worn in the United States army by general and staff
officers.
[1913 Webster]