GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Chapeau , n.; pl. Chapeux . [F., fr. OF. chapel hat. See Chaplet.]
   A hat or covering for the head.
   1913 Webster
   (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