Ovolo, a moulding, the profile of which resembles the outline of an egg, used in Classic architecture.
Pendentive, a feature in Byzantine and other domed buildings, employed to enable a circular dome to stand over a square space.
Peristylar, or Peripteral, with columns all round.
Peristylium, or Peristyle, in a Roman house, the inner courtyard; also any space or enclosure with columns all round it.
Piscina, a small basin usually executed in stone and placed within a sculptured niche, fixed at the side of an altar in a church, with a channel to convey away the water poured into it.
Polychromy, the use of decorative colours.
Precincts, the space round a church or religious house, usually enclosed with a wall.
Presbytery, the eastern part of a church, the chancel.
Profile (of a moulding), the outline which it would present if cut across at right angles to its length.
Pronaos, the front portion or vestibule to a temple.