/ dəʊm; NAmE doʊm/ noun
1.
a round roof with a circular base :
the dome of St Paul's Cathedral
2.
a thing or a building shaped like a dome :
his bald dome of a head
—picture at geodesic dome
3.
( NAmE ) (in names) a sports stadium whose roof is shaped like a dome :
the Houston Astrodome
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WORD ORIGIN
early 16th cent. (originally referring to a stately building): from Latin domus ; other senses are via French dôme , from Italian duomo cathedral, dome.