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Adjective: lacunar  lu'k(y)oo-nu(r)
  1. Pertaining to, or having, lacunae
    "a lacunar circulation"
Noun: lacunar  lu'k(y)oo-nu(r)
  1. One of the sunken panels in such a ceiling
  2. The ceiling or under surface of any part, especially when it consists of compartments, sunk or hollowed without spaces or bands between the panels

Derived forms: lacunars

Encyclopedia: Lacunar