or bub·ble-top

[buhb-uh l-top]
  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.
  1. fitted with such a dome: a bubbletop limousine.

Origin of bubbletop

First recorded in 1965–70; bubble + top1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018