Definition of blockhouse
1a
: a structure of heavy timbers formerly used for military defense with sides loopholed and pierced for gunfire and often with a projecting upper story
b
: a small easily defended building for protection from enemy fire
2
: a building usually of reinforced concrete serving as an observation point for an operation likely to be accompanied by heat, blast, or radiation hazard
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Merriam-Webster unabridged
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Time Traveler for blockhouse
The first known use of blockhouse was in 1512
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