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gibus

gibus
  (ˈdʒaɪbəs)
  [f. Gibus the name of the first maker.]
  An opera or crush hat. Also gibus-hat.

1848 Thackeray Bk. Snobs xviii, With his gibus-hat and his little glazed pumps. a 1854 E. Forbes Lit. Papers viii. (1855) 214 No man in a gibus ever commanded public awe or private respect. 1888 Daily Tel. 28 Apr. 5/2 The collapsible crush hat or Gibus.

Oxford English Dictionary

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