| 1 | English | dowle | feathery or woolly down; filament of a feather |
| 2 | Old French | doelle | the hollow part of a tool where the handle is;... |
| 3 | Frankish | duli | pipe, tube, conduit; hollow tube, pipe; tube,... |
| 4 | Proto-Germanic | dulją | tube, pipe; nozzle, spout |
| 5 | Proto-Indo-European | dʰel- | an arch, vaulting, curve, curvature, cavity;... |