Dome

n. curved hemispherical roof or ceiling, cupola, anything shaped like a dome

A dome is a common structural element of architecture that resembles the hollow upper half of a sphere.
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The word dome has a number of meanings. Most commonly, it is a structural element in architecture that resembles the hollow upper half of a sphere.
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Noun
1. a concave shape whose distinguishing characteristic is that the concavity faces downward
(hypernym) concave shape, concavity, incurvation, incurvature
2. informal terms for a human head
(synonym) attic, bean, bonce, noodle, noggin
(hypernym) human head
3. a stadium that has a roof
(synonym) domed stadium, covered stadium
(hypernym) stadium, bowl, arena, sports stadium
4. a hemispherical roof
(hypernym) roof
(hyponym) astrodome

n. cathedral, main church of a diocese

n. cupola, dome, curved hemispherical roof or ceiling