plinth

Definition

1. A square or rectangular base for
column, pilaster, or door framing. 2. A solid
monumental base, often ornamented with
moldings, bas reliefs, or inscriptions, to support a statue or memorial. 3. A recognizable base of an external wall, or the base courses of a building collectively, if so treated as to give the appearance of a platform. -- The Illustrated Dictionary of Historic Architecture