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demi-bastion

demi-bastion Fortif.
  (ˈdɛmɪˈbæstɪən)
  [demi- 5.]
  A work of the form of half a bastion, having one face and one flank. Hence ˈdemi-ˈbastioned a., having demi-bastions.

1695 Lond. Gaz. No. 3100/4 The Dutch were not able to maintain themselves in the Demi-Bastion. 1813 Chron. in Ann. Reg. 198/2 Against the demy-bastion on the south-eastern angle and the termination of the curtain of the southern face. 1832 Southey Hist. Penins. War III. 235 Their efforts had been misdirected against the face of a demibastion. 1851 J. S. Macaulay Field Fortif. 22 Of Demi-bastioned Forts.

Oxford English Dictionary

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