1. an electric bus that gets power from overhead wires through poles on its roof

Examples

• The trolleybus glided silently down the main street.
• Many cities replaced their trolleybuses with diesel buses in the 1960s.
• The trolleybus system in San Francisco still operates today.
• She waited at the stop for the next trolleybus to arrive.
• The trolleybus disconnected from the overhead wires and had to be reconnected.
• Trolleybuses produce no local emissions since they run on electricity.