Oillet.—A loophole for the discharge of arrows.
Oriel.—A bay window on an upper floor, corbelled out from the wall below.
Panelling.—A series of panels formed of boards whose edges are held in the groove of a thicker surrounding frame.
Parapet.—The upper part of a wall carried above the springing of the roof. Where the roof was flat it formed a protection to those who used the roof for defence or other purposes.
Pedestal.—A substructure carrying a column or pilaster.
Pediment.—The triangular or segmental space formed by the carrying up of a cornice over a door or window or in a gable, &c.
Peel or Pele.—A fortified tower or stronghold forming a dwelling; a term principally applied to the fortified houses of the North.
Pier.—A pillar or column; also sometimes a flat buttress.
Pilaster.—A square pillar or column attached to a wall, usually of slight projection.
Pitch (of a Roof).—The slope.