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

One of the sunken panels in such a ceiling.

is the Latin name in architecture for a panelled or coffered ceiling or soffit. The word is derived from lacuna, a cavity or hollow, a blank, hiatus or gap. The panels or coffers of a ceiling are by Vitruvius called lacunaria.

A subtype of stroke that affects the deeper parts of the brain and involves the tiny perforating arteries.

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