Plural of cupola; small dome-like structures on top of buildings, typically used for decoration or ventilation.
From Italian 'cupola' (dome) derived from Latin 'cuppa' (cup), and Greek 'kouppa.' The shape resembles an upside-down cup, hence the name.
Cupolas became wildly fashionable in the American colonies—almost every courthouse, meetinghouse, and fancy barn got one because they looked important and let hot air escape!
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