a round roof with a circular base 穹顶 
the dome of St Paul’s Cathedral 圣保罗大教堂的穹顶
a thing or a building that is like a dome in shape 圆顶状物；穹状建筑物 his bald dome of a head 他圆溜溜的秃顶
- (North American English)
(in names 用于名称 a sports stadium whose roof is shaped like a dome 圆顶体育场 the Houston Astrodome 休斯敦阿斯托洛圆顶运动场
Word Originearly 16th cent. (originally referring to a stately building): from Latin domus; other senses are via French dôme, from Italian duomo ‘cathedral, dome’.