Lacunar meaning

lə-kyo͝o'nər
A ceiling constructed with recessed panels.
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A recessed panel in such a ceiling.
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Of or having a lacuna or lacunas.
adjective
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A ceiling made up of sunken panels.
noun
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A sunken panel in such a ceiling.
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(medicine) Of or pertaining to a lacuna.
adjective
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(architecture) A coffer; a ceiling constructed of coffers.
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Origin of lacunar

Latin lacūnar from lacūna hole lagoon