PILASTER

, in Architecture, a square column, sometimes insulated, but more frequently let within a wall, and only projecting by a 4th or 5th part of its thickness.

The Pilaster is different in the different orders; borrowing the name of each order, and having the same proportions, and the same capitals, members, and ornaments, with the columns themselves.

Demi Pilaster, called also Membretto, is a Pilaster that supports an arch; and it generally stands against a pier or column.