Lacunar
Pronunciation : La*cu"nar, n.; pl. E. Lacunars
Part of Speech : L.
Etymology : [L.] (Arch.) (a) The ceiling or under surface of any part, especially when it consists of compartments, sunk or hollowed without spaces or bands between the panels. Gwilt (b) One of the sunken panels in such a ceiling.
Definition :
Lacunaria.
Source : Webster's Unabridged Dictionary, 1913