The molding or border above the base of a structure (a pedestal or podium or wall)

WordNet Word definitions in WordNet
n. the molding or border above the base of a structure (a pedestal or podium or wall)

Wiktionary Word definitions in Wiktionary
n. (context architecture English) the uppermost part of the moulding of a baseboard, a pedestal or a similar construct vb. (context architecture English) to lower the rise of an arch

Wikipedia Word definitions in Wikipedia
Surbase ( Lat. super , whence the Fr. sur , above or upon, and base ), i.e., upper base, the term in architecture applied to what, in the fittings of a room, is called the chair-rail. It is also used to distinguish the cornice of a pedestal or podium and ...

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Surbase \Sur"base`\, n. [Pref. sur- + base.] (Arch.) A cornice, or series of moldings, on the top of the base of a pedestal, podium, etc. See Illust. of Column . A board or group of moldings running round a room on a level with the tops of the chair backs. ...