blockhouse

(-ho̵us′)

noun

  1. Historical a strong wooden fort with a projecting second story and openings in the walls for the defenders to shoot from
  2. ☆ any building of squared timber or logs
  3. Mil. a small defensive structure of concrete
  4. ☆ a dome-shaped, heavily reinforced structure, with periscopes and detecting instruments, to protect observers of missile launchings, nuclear explosions, etc.

See blockhouse in American Heritage Dictionary 4

noun
  1. A military fortification constructed of sturdy material, such as concrete, and designed with ports for defensive firing or observation.
  2. A heavily reinforced building used for launch operations of missiles and space launch vehicles.
  3. A fort made of squared timbers with a projecting upper story.

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