Crownwork

[kroun-wurk] /ˈkraʊnˌwɜrk/

noun, Fortification.
1.
an outwork containing a central bastion with a curtain and demibastions, usually designed to cover some advantageous position.
/ˈkraʊnˌwɜːk/
noun
1.

2.
(fortifications) a covering or protective outwork

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