La-cū'na, n.
n.; pl. LA-CŪ'NE. [Lat., ditch, pit, tank, lake, originally any thing hollow, Gr. λάκος, λάκκος, hole, pit, cistern, tank.]
- A small opening; a small pit or depression; a small blank space; a gap or vacancy; a hiatus.
- (Anat.) A cavity or sack, usually of very small size, in a mucous membrane.
- (Bot.) (a.) The small pit or cup-shaped depression in the top of the thallus of some lichens. (b.) A vacant space between the cells of plants; an air-cell.