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The Collaborative International Dictionary of English v.0.48 (gcide)

Blockhouse \Block"house`\, n. [Block house: cf. G. blockhaus.]
1. (Mil.) An edifice or structure of heavy timbers or logs
for military defense, having its sides loopholed for
musketry, and often an upper story projecting over the
lower, or so placed upon it as to have its sides make an
angle wit the sides of the lower story, thus enabling the
defenders to fire downward, and in all directions; --
formerly much used in America and Germany.
[1913 Webster]

2. A house of squared logs. [West. & South. U. S.]
[1913 Webster]