Octastyle, an edifice having eight co^.
lumns in front.
Odeum, a structure built by Pericles, at
Athens, for the performance of music.
Plutarch says it had within many rows
of seats and of pillars. The roof was of
a conical figure, after the model of the
king of Persia's pavilion.
OZci, halls. See the account of the Ro-
Ogee, a cyma reversa.
Order, in Architecture, a column entire,
consisting of base, shaft, and capital,
with an entablature. For a particular
account of each order, see the beginning
of this work.
Ova, or ovum. See Echinus.
Ovolo, a moulding which projects one
quarter of a circle, called also a quarter
round. See Plate 8.
Palm. See Measure.