Pi-läs’ter, n.

noun

n. [Fr. pilastre, Sp. pilastra, It. pilastro, L. Lat. pilastrum, fr. Lat. pila, a pillar.] (Arch.) A square column, sometimes insulated, but usually set within a wall, and projecting only a fourth or fifth of its diameter. The bases, capitals, and entablatures of pilasters have the same parts as those of columns. Gwilt.

An ornamental classical pilaster with a decorated capital and a fluted shaft. — Pilaster.