One of the mysteries of the English language finally explained.
1Of the nature of a dado; (of a wall or room) provided with a dado.
2North American Woodworking and Joinery. Designating a joint in which the edge of a piece of wood is fixed into a channel or slot cut across the grain in the face of another piece of wood; designating a channel or slot of this kind.
Mid 18th century; earliest use found in William Pain (fl. 1743–1794), writer on architecture. From dado + -ed.
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