brattice

[brat-is]
noun
1.
a partition or lining, as of planks or cloth, forming an air passage in a mine.
2.
(in medieval architecture) any temporary wooden fortification, especially at the top of a wall.
verb (used with object), bratticed, bratticing.
3.
to provide with a brattice (often followed by up ).

Origin:
1300–50; Middle English brutaske, bretage, bretice < Anglo-French bretaske, bretage, Anglo-French, Old French bretesche wooden parapet on a fortress < Medieval Latin (9th century) brittisca, apparently a Latinized form of Old English Bryttisc British (or a new formation in ML), on the presumption that such parapets were introduced from Britain

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World English Dictionary
brattice (ˈbrætɪs)
 
n
1.  a partition of wood or treated cloth used to control ventilation in a mine
2.  medieval fortifications a fixed wooden tower or parapet
 
vb
3.  (tr) mining to fit with a brattice
 
[C13: from Old French bretesche wooden tower, from Medieval Latin breteschia, probably from Latin Britō a Briton]

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Example sentences
Brattice hung in the cavity helped reduce methane concentrations without
  auxiliary ventilation.
He issued the citation because he observed the brattice line attached to the
  roof and the area was not supported.
However, brattice cloth was wrapped around the pick breaker.
The return air was pulled from the gallery behind a brattice and wood wall
  built along the right side of the entry.
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