
1) Fastness 2) Military science 3) Stronghold 4) Type of Fortification
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https://www.crosswordclues.com/clue/blockhouse

1) Igloo
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https://www.crosswordclues.com/clue/blockhouse

In military science, a blockhouse is a small, isolated fort in the form of a single building. It serves as a defensive strong point against any enemy that does not possess siege equipment or, in modern times, artillery. A fortification intended to resist these weapons is more likely to qualify as a fortress or a redoubt, or in modern times, be an ...
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http://en.wikipedia.org/wiki/Blockhouse

• (n.) 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 muc...
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http://thinkexist.com/dictionary/meaning/blockhouse/

Strong construction used to house personnel and instruments in a static or flight test. Generally has extremely durable overhead construction.
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http://www.aeroconsystems.com/glossary.htm

Small square fortification, usually of timber bond overlapping arrangement of bricks in courses (flemish, dutch, french, etc.)
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http://www.castlesontheweb.com/glossary.html

The blockhouse at Cape Caneveral Launch Complex 34 (LC-34), with the service structure rising behind it, November 1960. Credit: NASA A heavily reinforced building, designed to withstand blast and heat, which, in the early years of space exploration, contained the electronic controls and equipmen...
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http://www.daviddarling.info/encyclopedia/B/blockhouse.html

Small square fortification, usually of timber bond overlapping arrangement of bricks in courses (flemish, dutch, french, etc.)
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http://www.encyclo.co.uk/local/20018

small fortified barrack
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http://www.encyclo.co.uk/local/22129
Block'house` noun [
Block +
house : confer German
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...
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http://www.encyclo.co.uk/webster/B/67

A blockhouse is a defensible post, usually rectangular, constructed to give shelter and protection to its garrison, consisting of possibly thirty men.
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http://www.probertencyclopaedia.com/browse/FB.HTM

[
n] - a stronghold that is reinforced for protection from enemy fire
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http://www.webdictionary.co.uk/definition.php?query=blockhouse

small fortified barrack
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https://www.encyclo.co.uk/local/20402
noun a stronghold that is reinforced for protection from enemy fire; with apertures for defensive fire
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https://www.encyclo.co.uk/local/20974
No exact match found.