Dado n. : That part of a pedestal included between the base and the cornice (or surbase); the die. See Illust. of Column.

Dado n. : In any wall, that part of the basement included between the base and the base course. See Base course, under Base.

Dado n. : In interior decoration, the lower part of the wall of an apartment when adorned with moldings, or otherwise specially decorated.

Example:
How deep should a Dado be in cabinet grade plywood?

Taxonomy
joinery, free encyclopedia, grain, housing, passes, trench cut, rebate, search, Unsourced, Canada, Europe, slot, machinable material, cross-section, three sides, perpendicular, edge, shelves.

Defination from the web:
dado (US and Canada), housing (UK) or trench (Europe) is a slot or trench cut into the surface of a piece of machinable material, usually wood. ... A dado is cut across, or perpendicular to, the grain and is thus differentiated from a groove which is cut with, or parallel to, the grain. ...