rotunda

English Thesaurus

1. a large circular room (noun.artifact)

hypernym	:	room,
definition	:	an area within a building enclosed by walls and floor and ceiling (noun.artifact)

2. a building having a circular plan and a dome (noun.artifact)

hypernym	:	building, edifice,
definition	:	a structure that has a roof and walls and stands more or less permanently in one place (noun.artifact)