Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A ceiling constructed with recessed panels.
  • n. A recessed panel in such a ceiling.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Of or pertaining to a lacuna
  • n. A coffer; a ceiling constructed of coffers

from the GNU version of the Collaborative International Dictionary of English

  • n. The ceiling or under surface of any part, especially when it consists of compartments, sunk or hollowed without spaces or bands between the panels.
  • n. One of the sunken panels in such a ceiling.

from The Century Dictionary and Cyclopedia

  • Of or pertaining to a lacuna.
  • Having lacunæ; lacunose. Also lacunal.
  • n. One of the coffers or sunk compartments in ceilings or soffits formed of beams crossing one another, or resembling in structural form or for purposes of decoration such a construction of beams, as the stone ceilings of the Grecian Doric, those (generally formed of wood and plaster, and profusely decorated with gilding and ornament) common in Renaissance buildings, etc.
  • n. Hence A ceiling or soffit having lacunars.

Etymologies

Latin lacūnar, from lacūna, hole; see lagoon.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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