The inscription, cut vertically down the shaft of an incised Latin cross, reads "OR[-]DOMNALL", with one letter lost to damage or wear. The "OR" is most likely an abbreviated form of the Latin "oroit", a prayer formula meaning something like "a prayer for", commonly found on early Irish memorial stones. What remains, then, is a request for intercession on behalf of someone named Domnall, a name widespread in medieval Ireland, though this particular Domnall remains unidentified.

The slab lies in the Saint's graveyard on Inis Cealtra, the sacred island off the eastern shore of County Clare that was a significant monastic site throughout the early and high medieval periods. A cross-slab is exactly what it sounds like: a slab of stone carved with a cross, typically used as a grave marker. This one measures 1.77 metres in height and 0.52 metres wide, with a face incised with an outline Latin cross whose angles are hollowed out, a feature that gives the design a slightly angular, architectural quality. Macalister, writing in 1916 and 1917, classified it as twelfth-century in type and recorded details that are no longer fully visible on the stone itself, including a triangular base and two horizontal lines running outward from the shaft just above it. Later scholarship by Okasha and Forsyth confirmed the inscription and dimensions. The lower portion of the slab is considerably worn, and the features Macalister drew can now only be confirmed through a rubbing rather than direct examination of the stone's surface, a reminder of how quickly even durable things can become illegible.