Definition of cupola
1a
: a rounded vault resting on a usually circular base and forming a roof or a ceiling
b
: a small structure built on top of a roof
2
: a vertical cylindrical furnace for melting iron in the foundry that has tuyeres and tapping spouts near the bottom
3
: a raised observation post in the roof of a railroad caboose
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Merriam-Webster unabridged
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Time Traveler for cupola
The first known use of cupola was in 1549
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