dado

(noun) panel forming the lower part of an interior wall when it is finished differently from the rest of the wall. Synonyms: wainscot.

(noun) the section of a pedestal between the base and the surbase.

(noun) a rectangular groove cut into a board so that another piece can fit into it.

(verb) provide with a dado. Examples: "The owners wanted to dado their dining room."

(verb) cut a dado into or fit into a dado.