Lacunar a. : Pertaining to, or having, lacunae; as, a lacunar circulation.

Lacunar 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.

Lacunar n. : One of the sunken panels in such a ceiling.

Example:
Why would a CT obtained the 3rd day after a Lacunar stroke be normal?

Taxonomy
Lacunar stroke, stroke, artery, syndrome, symptoms, lacunar, lacunar infarcts, stroke patients, hemiparesis, LACI, limb, infarct, lacunar strokes, internal capsule, free encyclopedia, pathology, atheroma, lacunes.

Defination from the web:
Lacunar strokes may result from carotid artery pathology or microemboli from the heart as in atrial fibrillation. Patients often recover well, but if there is enough white matter disease from lacunar pathology, one can see a subcortical dementia such as Binswanger disease. ...