Pronunciation: (thō'los, -lōs), [key]
—pl. -loiPronunciation: (-loi). [key]
1. (in classical architecture)
a. a circular building.
b. a small, round structure, as a lantern.
c. a circular subterranean tomb, lined with masonry.
2. a subterranean domed tomb chamber of the Mycenaean age.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.