Odeon \O*de"on\, n. [NL., fr. Gr. ?, fr. ?: cf. F. od['e]on. See
{Ode}.]
A kind of theater in ancient Greece, smaller than the
dramatic theater and roofed over, in which poets and
musicians submitted their works to the approval of the
public, and contended for prizes; -- hence, in modern usage,
the name of a hall for musical or dramatic performances.
[1913 Webster]