coffer
US /ˈkɑː.fɚ/
UK /ˈkɑː.fɚ/

1.
2.
3.
a decorative sunken panel in a ceiling or dome
:
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The grand hall featured a ceiling adorned with intricate coffers.
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The dome of the Pantheon is famous for its massive coffers.
a decorative sunken panel in a ceiling or dome