A bullaun is a boulder or rock, usually sandstone or granite, into which one or more cup-shaped depressions have been ground, either by human hand or, more rarely, by natural weathering. The water that collects in these hollows has long been considered curative or spiritually significant, and many bullauns are found near early ecclesiastical sites, holy wells, or ancient field boundaries, suggesting a continuity of use stretching back through early medieval Christianity into something older and less easily categorised.

The name Cúíl Each, meaning something close to "horse's corner" or "nook of the horse" in Irish, hints at a landscape long shaped by human and animal activity, though the specific history of this particular stone remains sparsely documented. Bullaun stones as a class are widespread across Ireland, with concentrations in the west and midlands, and their functions have been interpreted variously as grain-grinding basins, ritual water vessels, or markers associated with cursing and blessing rites. The stones themselves are often immovable, or believed to return to their original position if moved, a quality that in local tradition signals their sacred nature. Without more detailed recorded information specific to this site, the stone at Cúíl Each stands in this broader company, a survivor whose particular story is still waiting to be fully told.