Pronunciation: (bub'ul-top"), [key]
1. a transparent dome, usually made of plastic or bulletproof glass, that serves as the roof or part of the roof of an automotive vehicle.
2. a vehicle having such a dome: The old van was converted into a bubbletop.
fitted with such a dome: a bubbletop limousine. Also,bub'ble-top".
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.