a transparent dome, usually made of plastic or bulletproof glass, that serves as the roof or part of the roof of an automotive vehicle.
a vehicle having such a dome:
The old van was converted into a bubbletop.
fitted with such a dome:
a bubbletop limousine.
verb (intransitive, adverb) to remain just beneath a particular level to continue in the background or under the surface Historical Examples The Adventures of Kathlyn Harold MacGrath In the Wilds of Africa W.H.G. Kingston
a clear, bubble-filled plastic material used especially for cushioning breakable objects during shipment. Historical Examples Makers Cory Doctorow noun a type of polythene wrapping containing many small air pockets, used as a protective covering when transporting breakable goods