ETYM Italian cupola, Late Lat. cupula, cuppula (cf. Latin cupula little tub). from cupa, cuppa, cup; cf. Latin cupa tub. So called on account of its resemblance to a cup turned over. Related to Cup, Cupule.
1. A roof in the form of a dome.
2. A vertical cylindrical furnace for melting iron for casting.
Spherical vault or concave ceiling; dome, especially small.