Armored citadel
From Infogalactic: the planetary knowledge core

A schematic of the HMS Inflexible depicting her rectangular citadel in the centre.
In a ship an armored citadel is an armored box enclosing the machinery and magazine spaces. It was formed by the armored deck, the waterline belt and the transverse bulkheads.[1]
Citations
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Bibliography
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- ↑ Raven and Roberts, p. 9