Hypertext Webster Gateway: "rotunda"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Rotunda \Ro*tun"da\, n. [Cf. It. rotonda, F. rotonde; both fr.
L. rotundus round. See {Rotund}, a.] (Arch.)
A round building; especially, one that is round both on the
outside and inside, like the Pantheon at Rome. Less properly,
but very commonly, used for a large round room; as, the
rotunda of the Capitol at Washington.
From WordNet (r) 1.7 (wn)
rotunda
n 1: a building having a circular plan and a dome
2: a large circular room
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