a structure or cylinder-shaped drum used to support a cupola or dome
tholus in American English
(ˈθouləs)
nounWord forms: plural-li (-lai)
tholos
Word origin
[1635–45; ‹ L ‹ Gk thólos]This word is first recorded in the period 1635–45. Other words that entered Englishat around the same time include: abutment, cascade, focus, reaction, recruit