Coffer

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In architecture, a coffer (plural: coffering) is a sunken panel in the shape of a square, rectangle, or octagon that serves as a decorative device, usually in a ceiling. An example of this can be found in the ceiling of the rotunda dome in the Roman Pantheon.

In fortification, a coffer was a hollow lodgment, against a dry moat, from six to seven feet deep, and from sixteen to eighteen feet broad; the upper part being made of pieces of timber raised two feet above the level of the moat. The besieged generally made use of these coffers to repulse the besiegers, when they tried to pass the ditch.

A coffer can also be a secured chest or box.