concave shape, concavity, incurvation, incurvature - a shape that curves or bends inward

human head - the head of a human being

sports stadium, stadium, arena, bowl - a large structure for open-air sports or entertainments

astrodome - a transparent dome on top of an airplane where the navigator can make celestial observations

cupola - a roof in the form of a dome

geodesic dome - a lightweight dome constructed of interlocking polygons; invented by R. Buckminster Fuller

onion dome - a dome that is shaped like a bulb; characteristic of Russian and Byzantine church architecture

pressure dome - a dome-shaped building that is pressurized

roof - a protective covering that covers or forms the top of a building

whispering dome, whispering gallery - a space beneath a dome or arch in which sounds produced at certain points are clearly audible at certain distant points