tholos
Concise Oxford English Dictionary © 2008 Oxford University Press:
tholos /ˈθɒlɒs/
▶noun (pl. tholoi /-lɔɪ/) Archaeology a dome-shaped tomb of ancient Greek origin, especially one dating from the Mycenaean period.
– origin from Gk.
'tholos' also found in these Oxford entries:

