Fortifications or structures built at the head or top of something, especially defensive structures at the entrance of a fortress or the control structures of a dam or canal system.
From 'head' (chief, principal structure) and 'works' (fortified structures). Developed as a military/engineering term in the 1600s-1700s when complex fortification systems required precise technical vocabulary.
Medieval castles had ingenious headworks—the structures defending the main entrance—because engineers knew attackers would focus there, making it the most heavily fortified part of the entire castle!
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