What does dado mean?
A dado is the lower section of an interior wall, extending from the floor up to roughly waist or chair-back height and finished in a way that distinguishes it from the wall above — commonly with wooden paneling, tiles, or a contrasting paint color. In traditional interiors, a horizontal molding known as a dado rail or chair rail often caps it, originally designed to protect plaster walls from being scuffed by chair backs. In carpentry, the word has a second meaning: a rectangular channel cut across the grain of a board to receive another piece, prized for the strength it lends shelving and cabinetry joints. Derived from the Italian word for a die, the term entered English architectural vocabulary in the seventeenth century. Today it survives chiefly in interior design, restoration work, and fine woodworking.
The part of an interior wall below roughly waist or chair-back height, finished distinctly — as with paneling, tiling, or a different color — from the wall above.
"They installed tongue-and-groove boarding to form a painted dado in the hallway."
Often discussed together with the dado rail (chair rail) that marks its top edge.
In carpentry, a rectangular groove cut across the grain of a board to receive the end or edge of another piece, forming a sturdy right-angle joint.
"Fixed shelves are strongest when housed in a glued dado rather than merely screwed to the sides."
Commonly called a 'dado joint'; in Britain also known as a housing joint.
Both plural forms are accepted; 'dados' is the more common modern spelling.
"The two front rooms both had original Victorian dados intact beneath the wallpaper."
Named after an Italian word for 'die' — because that little cube-shaped gaming piece inspired one of architecture's most enduring interior features.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of dado
The word comes from Italian dado, meaning 'die' or 'cube,' adopted into English architectural terminology in the seventeenth century. Italian builders likened the solid, block-like base of a pedestal or column to a gaming die, and the name was extended to the corresponding lower zone of an interior wall. The Italian word itself descends from the Latin datum, 'something given,' the same root that gives English 'data' and 'date.'
How dado is actually used
Primarily used in interior design, architecture, and carpentry contexts; familiar to decorators and woodworkers but less so to general readers. In British English the term appears frequently in decorating discussions, often paired with 'dado rail.' The plural is usually 'dados,' occasionally 'dadoes.'
Easily confused with dado
A dodo is an extinct flightless bird, while a dado is an architectural feature of walls or a carpentry groove.
A dado rail (or chair rail) is specifically the horizontal molding fixed along the top edge of a dado, not the paneled lower wall itself.