The name Rathmeelaghmore has persisted since at least the first Ordnance Survey mapping of 1838, appearing again on the 1929 edition, which suggests the feature was legible enough in the landscape to anchor local geography across nearly a century of cartography. A rath is a roughly circular enclosure, typically earthen, that served as a farmstead or small settlement in early medieval Ireland, and this one made deliberate use of the terrain: the interior sits some four to five metres above the surrounding field level, with the knoll itself doing much of the defensive work.

The enclosure measures approximately 26.8 metres across on a north-west to south-east axis. It is defined by an earthen bank, now largely worn to a scarp rather than a proper raised bank, reaching around 1.9 metres in external height at its best-preserved northern arc. Outside the bank runs a fosse, a ditched channel roughly 3.4 metres wide, accompanied by a further external bank. Both features are reasonably distinct at the north but fade to little more than a terrace with a low outer edge elsewhere, and disappear entirely along the eastern and southern sides. Along the inner edge at the east, a row of low, contiguous stones may be the remnant of a kerb, the kind of stone edging sometimes used to reinforce or line the base of an earthen bank. The entrance was most probably at the east, where the ground level drops relative to the exterior, though no clearly defined gateway feature survives.