01 n. The ceiling or under surface of any part, especially when it consists of compartments, sunk or hollowed without spaces or bands between the…
pl.
Lacunars, Lacunaria ((lȧ*kū"nẽrz))
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1.
The ceiling or under surface of any part, especially when it consists of compartments, sunk or hollowed without spaces or bands between the panels.(Arch.)