"Caher" derives from the Irish cathair, meaning a stone fort or enclosure, and its appearance in a place name often signals that something old and circular survives in the landscape, even when the documentary record has yet to catch up with it. In east County Clare, where the limestone karst of the Burren gives way to more pastoral ground, these enclosures can be easy to overlook, their walls reduced to low ridges or absorbed into field boundaries over centuries of agricultural reuse.

An enclosure of this type would generally refer to a roughly circular or oval area defined by an earthen bank, a stone wall, or a combination of both. In Irish archaeology, such features are most commonly associated with the early medieval period, roughly 500 to 1200 AD, and served as farmsteads or settlement enclosures. The cashel, a stone-built variant, was the standard form across the limestone districts of Clare and Galway. Whether the structure at Caherhurly retains visible stonework, has been reduced to a cropmark, or survives as a more substantial feature, remains a question the available record does not yet answer in any detail.