added by archaeologs
[Greek odeion: 'music-hall']. The term perhaps originates with the Odeion built by Pericles at ATHENS in the 5th century BC and intended for musical and artistic performances of some kind. This seems to have been a large rectangular building, with a forest of internal columns, and capped by a pyramidshaped roof. The term is loosely used, however, of many types of roofed hall. Roman examples often amount to small semicircular THEATRES, and are occasionally unroofed.
The Macmillan dictionary of archaeology, Ruth D. Whitehouse, 1983