"Lacunar" is a word in ENGLISH

lacunar ENGLISH
Definition:

One of the sunken panels in such a ceiling.

lacunar ENGLISH
Definition:

The ceiling or under surface of any part, especially when
it consists of compartments, sunk or hollowed without spaces or bands
between the panels.

lacunar ENGLISH
Definition:

Pertaining to, or having, lacunae; as, a lacunar
circulation.

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caisson ENGLISH

A sunk panel of ceilings or soffits.

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coffer ENGLISH

A panel deeply recessed in the ceiling of a vault, dome, or portico; a caisson.

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panel ENGLISH

A sunken compartment with raised margins, molded or otherwise, as in ceilings, wainscotings, etc.

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