an electrically driven public-transport vehicle that does not run on rails but takes its power from an overhead wire through a trolley
Collins Concise English Dictionary © HarperCollins Publishers::
trol′ley bus′,
- Transporta passenger bus operating on tires and having an electric motor that draws power from overhead wires. Also called trackless trolley, trol′ley coach′.
- 1910–15
'trolleybus' also found in these entries (note: many are not synonyms or translations):