A skilled worker who builds walls, especially dry-stone walls made without mortar, fitting stones together precisely.
From 'wall' plus the agent suffix '-er' (one who does the action). The term has been used since medieval times for stone masons and construction workers specializing in wall building.
Dry-stone wallers are like puzzle masters—they can feel a stone's weight and shape and somehow fit irregular rocks together so tightly that the wall lasts hundreds of years without any glue holding it together.
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