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bastillion

baˈstillion Obs. or Hist.
  Forms: 6–7 bastilion, 7 bastillon, 6–9 bastillion.
  [a. OF. bastillon, -illion, dim. of bastille; see prec.]
  A small fortress or castle; a fortified tower.

1549 Thomas Hist. Italy 101 Buildyng of fortresses and bastilions about Petabubula. 1603 Knolles Hist. Turks (1621) 82 They gained one of the greatest bastillions..of the citie, called the Angels tower. 1825 Southey in Q. Rev. XXXII. 385 An assult was made..upon a bastillion by the gate of Codalonga.

Oxford English Dictionary

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